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-40-7x=-40-2x
We move all terms to the left:
-40-7x-(-40-2x)=0
We add all the numbers together, and all the variables
-7x-(-2x-40)-40=0
We get rid of parentheses
-7x+2x+40-40=0
We add all the numbers together, and all the variables
-5x=0
x=0/-5
x=0
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