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306+x+(3x-6)=540
We move all terms to the left:
306+x+(3x-6)-(540)=0
We add all the numbers together, and all the variables
x+(3x-6)-234=0
We get rid of parentheses
x+3x-6-234=0
We add all the numbers together, and all the variables
4x-240=0
We move all terms containing x to the left, all other terms to the right
4x=240
x=240/4
x=60
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