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(x-30)+(x-30)+(x-30)+x=540
We move all terms to the left:
(x-30)+(x-30)+(x-30)+x-(540)=0
We add all the numbers together, and all the variables
x+(x-30)+(x-30)+(x-30)-540=0
We get rid of parentheses
x+x+x+x-30-30-30-540=0
We add all the numbers together, and all the variables
4x-630=0
We move all terms containing x to the left, all other terms to the right
4x=630
x=630/4
x=157+1/2
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