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10x+100=2x+15
We move all terms to the left:
10x+100-(2x+15)=0
We get rid of parentheses
10x-2x-15+100=0
We add all the numbers together, and all the variables
8x+85=0
We move all terms containing x to the left, all other terms to the right
8x=-85
x=-85/8
x=-10+5/8
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