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7+10x=-3x-7
We move all terms to the left:
7+10x-(-3x-7)=0
We get rid of parentheses
10x+3x+7+7=0
We add all the numbers together, and all the variables
13x+14=0
We move all terms containing x to the left, all other terms to the right
13x=-14
x=-14/13
x=-1+1/13
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