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2x-10+2x-30+7x=100
We move all terms to the left:
2x-10+2x-30+7x-(100)=0
We add all the numbers together, and all the variables
11x-140=0
We move all terms containing x to the left, all other terms to the right
11x=140
x=140/11
x=12+8/11
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