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10+3x=-4x+87
We move all terms to the left:
10+3x-(-4x+87)=0
We get rid of parentheses
3x+4x-87+10=0
We add all the numbers together, and all the variables
7x-77=0
We move all terms containing x to the left, all other terms to the right
7x=77
x=77/7
x=11
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