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(10x+2)+(2x-9)=30
We move all terms to the left:
(10x+2)+(2x-9)-(30)=0
We get rid of parentheses
10x+2x+2-9-30=0
We add all the numbers together, and all the variables
12x-37=0
We move all terms containing x to the left, all other terms to the right
12x=37
x=37/12
x=3+1/12
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