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X-30+X-30+X-30+X+X=540
We move all terms to the left:
X-30+X-30+X-30+X+X-(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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