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180=13x-7+8x-2
We move all terms to the left:
180-(13x-7+8x-2)=0
We add all the numbers together, and all the variables
-(21x-9)+180=0
We get rid of parentheses
-21x+9+180=0
We add all the numbers together, and all the variables
-21x+189=0
We move all terms containing x to the left, all other terms to the right
-21x=-189
x=-189/-21
x=+9
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