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10+7x=100+2x
We move all terms to the left:
10+7x-(100+2x)=0
We add all the numbers together, and all the variables
7x-(2x+100)+10=0
We get rid of parentheses
7x-2x-100+10=0
We add all the numbers together, and all the variables
5x-90=0
We move all terms containing x to the left, all other terms to the right
5x=90
x=90/5
x=18
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