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x+(3x+20)+2(3x+20)=725
We move all terms to the left:
x+(3x+20)+2(3x+20)-(725)=0
We multiply parentheses
x+(3x+20)+6x+40-725=0
We get rid of parentheses
x+3x+6x+20+40-725=0
We add all the numbers together, and all the variables
10x-665=0
We move all terms containing x to the left, all other terms to the right
10x=665
x=665/10
x=66+1/2
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