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40=42x+65
We move all terms to the left:
40-(42x+65)=0
We get rid of parentheses
-42x-65+40=0
We add all the numbers together, and all the variables
-42x-25=0
We move all terms containing x to the left, all other terms to the right
-42x=25
x=25/-42
x=-25/42
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