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-20x+166=-13x+103
We move all terms to the left:
-20x+166-(-13x+103)=0
We get rid of parentheses
-20x+13x-103+166=0
We add all the numbers together, and all the variables
-7x+63=0
We move all terms containing x to the left, all other terms to the right
-7x=-63
x=-63/-7
x=+9
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