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10x-3=84+21x+4
We move all terms to the left:
10x-3-(84+21x+4)=0
We add all the numbers together, and all the variables
10x-(21x+88)-3=0
We get rid of parentheses
10x-21x-88-3=0
We add all the numbers together, and all the variables
-11x-91=0
We move all terms containing x to the left, all other terms to the right
-11x=91
x=91/-11
x=-8+3/11
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