Question

Qual é
7x (x+4)=5x+40
6x+10=70
3x=120
7x+10=5x70
X+26=97
3x+8=29
8x (x+4)=5x+60
13. (X+3)+15=10 (x+4)+20
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Answer 1

a)

7.(x + 4) = 5x + 40
7x + 28 = 5x + 40
7x - 5x = 40 - 28
2x = 12
x = 12/2
x = 6
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b)

6x+10=70
6x = 70 - 10
6x = 60
x = 60/6
x = 10

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c)

3x = 120
x = 120/3
x = 40

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d)
7x + 10 = 5x + 70
7x - 5x = 70 - 10
2x = 60
x = 60/2
x = 30


¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
e)
x + 26 = 97
x = 97 - 26
x = 71


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f)
3x + 8 = 29
3x = 29 - 8
3x = 21
x = 21/3
x = 7


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g)
8.(x + 4) = 5x + 60
8x + 32 = 5x + 60
8x - 5x = 60 - 32
3x = 28
x = 28/3


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h)

13.(x + 3) + 15 =10.(x + 4) + 20
13x +39 + 15 = 10x + 40 + 20
13x + 54 = 10x + 60
13x - 10x = 60 - 54
3x = 6
x = 6/3
x = 2