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-135-x=6x+40
We move all terms to the left:
-135-x-(6x+40)=0
We add all the numbers together, and all the variables
-1x-(6x+40)-135=0
We get rid of parentheses
-1x-6x-40-135=0
We add all the numbers together, and all the variables
-7x-175=0
We move all terms containing x to the left, all other terms to the right
-7x=175
x=175/-7
x=-25
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