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(10x+21)+13x=180
We move all terms to the left:
(10x+21)+13x-(180)=0
We add all the numbers together, and all the variables
13x+(10x+21)-180=0
We get rid of parentheses
13x+10x+21-180=0
We add all the numbers together, and all the variables
23x-159=0
We move all terms containing x to the left, all other terms to the right
23x=159
x=159/23
x=6+21/23
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