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40+7x=9x+8
We move all terms to the left:
40+7x-(9x+8)=0
We get rid of parentheses
7x-9x-8+40=0
We add all the numbers together, and all the variables
-2x+32=0
We move all terms containing x to the left, all other terms to the right
-2x=-32
x=-32/-2
x=+16
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