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(2x+30)=40
We move all terms to the left:
(2x+30)-(40)=0
We get rid of parentheses
2x+30-40=0
We add all the numbers together, and all the variables
2x-10=0
We move all terms containing x to the left, all other terms to the right
2x=10
x=10/2
x=5
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