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(6x+7)+(13x+21)=180x=
We move all terms to the left:
(6x+7)+(13x+21)-(180x)=0
We add all the numbers together, and all the variables
-180x+(6x+7)+(13x+21)=0
We get rid of parentheses
-180x+6x+13x+7+21=0
We add all the numbers together, and all the variables
-161x+28=0
We move all terms containing x to the left, all other terms to the right
-161x=-28
x=-28/-161
x=4/23
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