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(21x+6)(90)=180
We move all terms to the left:
(21x+6)(90)-(180)=0
We multiply parentheses
1890x+540-180=0
We add all the numbers together, and all the variables
1890x+360=0
We move all terms containing x to the left, all other terms to the right
1890x=-360
x=-360/1890
x=-4/21
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