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x-30+x-30+x-30+2x=540
We move all terms to the left:
x-30+x-30+x-30+2x-(540)=0
We add all the numbers together, and all the variables
5x-630=0
We move all terms containing x to the left, all other terms to the right
5x=630
x=630/5
x=126
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