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-40=6x+7x-1
We move all terms to the left:
-40-(6x+7x-1)=0
We add all the numbers together, and all the variables
-(13x-1)-40=0
We get rid of parentheses
-13x+1-40=0
We add all the numbers together, and all the variables
-13x-39=0
We move all terms containing x to the left, all other terms to the right
-13x=39
x=39/-13
x=-3
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