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(4x-9)=40
We move all terms to the left:
(4x-9)-(40)=0
We get rid of parentheses
4x-9-40=0
We add all the numbers together, and all the variables
4x-49=0
We move all terms containing x to the left, all other terms to the right
4x=49
x=49/4
x=12+1/4
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