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171=5x+8x+2
We move all terms to the left:
171-(5x+8x+2)=0
We add all the numbers together, and all the variables
-(13x+2)+171=0
We get rid of parentheses
-13x-2+171=0
We add all the numbers together, and all the variables
-13x+169=0
We move all terms containing x to the left, all other terms to the right
-13x=-169
x=-169/-13
x=+13
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