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-213-3x=10x+125
We move all terms to the left:
-213-3x-(10x+125)=0
We get rid of parentheses
-3x-10x-125-213=0
We add all the numbers together, and all the variables
-13x-338=0
We move all terms containing x to the left, all other terms to the right
-13x=338
x=338/-13
x=-26
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