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3x+126+(3x+8)+(3x+10)=540
We move all terms to the left:
3x+126+(3x+8)+(3x+10)-(540)=0
We add all the numbers together, and all the variables
3x+(3x+8)+(3x+10)-414=0
We get rid of parentheses
3x+3x+3x+8+10-414=0
We add all the numbers together, and all the variables
9x-396=0
We move all terms containing x to the left, all other terms to the right
9x=396
x=396/9
x=44
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