7x+5x-7x+5x=20

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Solution for 7x+5x-7x+5x=20 equation: 



7x+5x-7x+5x=20

We move all terms to the left:

7x+5x-7x+5x-(20)=0

We add all the numbers together, and all the variables

10x-20=0

We move all terms containing x to the left, all other terms to the right

10x=20

x=20/10

x=2

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