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90+10.5x=180+7.5x
We move all terms to the left:
90+10.5x-(180+7.5x)=0
We add all the numbers together, and all the variables
10.5x-(7.5x+180)+90=0
We get rid of parentheses
10.5x-7.5x-180+90=0
We add all the numbers together, and all the variables
3x-90=0
We move all terms containing x to the left, all other terms to the right
3x=90
x=90/3
x=30
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