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-50-5x=-8x+13
We move all terms to the left:
-50-5x-(-8x+13)=0
We get rid of parentheses
-5x+8x-13-50=0
We add all the numbers together, and all the variables
3x-63=0
We move all terms containing x to the left, all other terms to the right
3x=63
x=63/3
x=21
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