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(-5+21x)+(19x+5)=180
We move all terms to the left:
(-5+21x)+(19x+5)-(180)=0
We add all the numbers together, and all the variables
(21x-5)+(19x+5)-180=0
We get rid of parentheses
21x+19x-5+5-180=0
We add all the numbers together, and all the variables
40x-180=0
We move all terms containing x to the left, all other terms to the right
40x=180
x=180/40
x=4+1/2
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