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8+x=3x-10
We move all terms to the left:
8+x-(3x-10)=0
We get rid of parentheses
x-3x+10+8=0
We add all the numbers together, and all the variables
-2x+18=0
We move all terms containing x to the left, all other terms to the right
-2x=-18
x=-18/-2
x=+9
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