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7=1x+40
We move all terms to the left:
7-(1x+40)=0
We add all the numbers together, and all the variables
-(x+40)+7=0
We get rid of parentheses
-x-40+7=0
We add all the numbers together, and all the variables
-1x-33=0
We move all terms containing x to the left, all other terms to the right
-x=33
x=33/-1
x=-33
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