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(23x-5)+(21x+5)+x=180
We move all terms to the left:
(23x-5)+(21x+5)+x-(180)=0
We add all the numbers together, and all the variables
x+(23x-5)+(21x+5)-180=0
We get rid of parentheses
x+23x+21x-5+5-180=0
We add all the numbers together, and all the variables
45x-180=0
We move all terms containing x to the left, all other terms to the right
45x=180
x=180/45
x=4
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