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2x-7x=13+8x
We move all terms to the left:
2x-7x-(13+8x)=0
We add all the numbers together, and all the variables
2x-7x-(8x+13)=0
We add all the numbers together, and all the variables
-5x-(8x+13)=0
We get rid of parentheses
-5x-8x-13=0
We add all the numbers together, and all the variables
-13x-13=0
We move all terms containing x to the left, all other terms to the right
-13x=13
x=13/-13
x=-1
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