Question

alguem sabe
a) 2x+5=5x-1
b) 5+6x=5x+2
c) x+2x-1=x+3
d) -3x+10=2x+8x-3x
e) 5x-5+2=9-x
f) 7(x-5)=3(x+1)
g) 3(x-2)=4(-x+3)
h) 2(x+1)-(x-1)=0
i) 5(x+1)-3(x+2)=0
j) 13+4(2x-1)=5(x+2)

Answer 1

a)
2x + 5 = 5x - 1
5 + 1 = 5x - 2x
6 = 3x
3x = 6
x = 6/3
x = 2
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b)
5 + 6x = 5x + 2
6x - 5x = 2 - 5
x = - 3
--------------------------------------------------------
c)
x + 2x - 1 = x + 3
3x - 1 = x + 3
3x - x = 3 + 1
2x = 4
x = 4/2
x = 2
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d)
- 3x + 10 = 2x + 8x - 3x
- 3x + 10 = 10x - 3x
- 3x + 10 = 7x
10 = 7x + 3x
10 = 10x
10x = 10
x = 10/10
x = 1
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e)
5x - 5 + 2 = 9 - x
5x - 3 = 9 - x
5x + x = 9 + 3
6x = 12
x = 12/6
x = 2
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f)
7.(x - 5) = 3.(x + 1)
7x - 35 = 3x + 3
7x - 3x = 3 + 35
4x = 38
x = 38 (:2)  =  19
       4  (:2)       2
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g)
3.(x - 2) = 4( - x + 3)
3x - 6 = - 4x + 12
3x + 4x = 12 + 6
7x = 18
x = 18
       7
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h)
2(x + 1) - (x - 1) = 0
2x + 2 - x + 1 = 0
x + 3 = 0
x = - 3
--------------------------------------------
i)
5.(x + 1) - 3(x + 2) = 0
5x + 5 - 3x - 6 = 0
2x - 4 = 0
2x = 4
x = 4/2
x = 2

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j)
13 + 4.(2x - 1) = 5(x + 2)
13 + 8x - 4 = 5x + 10
13 - 4 + 8x = 5x + 10
9 + 8x = 5x + 10
8x - 5x = 10 - 9
3x = 1
x = 1/3
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