Question

resolva as equaçoes 

a)3x+9=12

b)3x-8=13 

C12x-10=5x+11

d)7x+5=68-2x

e)14-3x=2x+29

f)8x-9=2x+11

g)10-4x=9-2x

h)x-3x+5x=12

i)8x-16=6x-10

j)22x-22=7x-5

k)3x+5=12-x
  

Ajudem por favor me respondem 

Answer 1

a)
3x+9=12
3x = 12 - 9 
3x = 3
x = 3/3
x = 1

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b)
3x-8=13 
3x = 13 + 8 
3x = 21
x = 21 / 3
x =  7 

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c)
12x-10=5x+11
12x - 5x = 11 + 10 
7x = 21
x = 21 / 7 
x = 3

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d)
7x+5=68-2x
7x + 2x = 68 - 5
9x = 63
x = 63 / 9
x = 7

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e)
14-3x=2x+29
-3x - 2x = 29 - 14
-5x = 15 * (-1)
5x = -15
x = -15 / 5 
x = - 3 

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f)
8x-9=2x+11
8x - 2x = 11 + 9 
6x = 20
x = 20 / 6 

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g)
10-4x=9-2x
-4x + 2x = 9 - 10
-2x = -1 (-1)
2x = 1
x = 1/2

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h)
x-3x+5x=12
-2x + 5x = 12
3x = 12
x = 12 / 3 
x = 4

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I)
8x-16=6x-10
8x + 6x = -10 + 16
2x = -6
x = -6 / 2
x = -3

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j)
22x-22=7x-5
22x - 7x = -5 + 22
15x = 17
x = 17/15

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k)
3x+5=12-x
3x + x = 12 - 5 
4x = 7
x = 7 / 4