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(4x-5)+(3x+5)=40
We move all terms to the left:
(4x-5)+(3x+5)-(40)=0
We get rid of parentheses
4x+3x-5+5-40=0
We add all the numbers together, and all the variables
7x-40=0
We move all terms containing x to the left, all other terms to the right
7x=40
x=40/7
x=5+5/7
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