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-131+3x=103-10x
We move all terms to the left:
-131+3x-(103-10x)=0
We add all the numbers together, and all the variables
3x-(-10x+103)-131=0
We get rid of parentheses
3x+10x-103-131=0
We add all the numbers together, and all the variables
13x-234=0
We move all terms containing x to the left, all other terms to the right
13x=234
x=234/13
x=18
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