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(14x+21)+(87-2x)=180
We move all terms to the left:
(14x+21)+(87-2x)-(180)=0
We add all the numbers together, and all the variables
(14x+21)+(-2x+87)-180=0
We get rid of parentheses
14x-2x+21+87-180=0
We add all the numbers together, and all the variables
12x-72=0
We move all terms containing x to the left, all other terms to the right
12x=72
x=72/12
x=6
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