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180=21x+3+35x+65
We move all terms to the left:
180-(21x+3+35x+65)=0
We add all the numbers together, and all the variables
-(56x+68)+180=0
We get rid of parentheses
-56x-68+180=0
We add all the numbers together, and all the variables
-56x+112=0
We move all terms containing x to the left, all other terms to the right
-56x=-112
x=-112/-56
x=+2
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