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9x+(-2x+5)=40
We move all terms to the left:
9x+(-2x+5)-(40)=0
We get rid of parentheses
9x-2x+5-40=0
We add all the numbers together, and all the variables
7x-35=0
We move all terms containing x to the left, all other terms to the right
7x=35
x=35/7
x=5
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