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(6x+7)+13x+21)=180
We move all terms to the left:
(6x+7)+13x+21)-(180)=0
We add all the numbers together, and all the variables
13x+(6x+7)=0
We get rid of parentheses
13x+6x+7=0
We add all the numbers together, and all the variables
19x+7=0
We move all terms containing x to the left, all other terms to the right
19x=-7
x=-7/19
x=-7/19
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