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90-x/2=180-3x
We move all terms to the left:
90-x/2-(180-3x)=0
We add all the numbers together, and all the variables
-x/2-(-3x+180)+90=0
We get rid of parentheses
-x/2+3x-180+90=0
We multiply all the terms by the denominator
-x+3x*2-180*2+90*2=0
We add all the numbers together, and all the variables
-1x+3x*2-180=0
Wy multiply elements
-1x+6x-180=0
We add all the numbers together, and all the variables
5x-180=0
We move all terms containing x to the left, all other terms to the right
5x=180
x=180/5
x=36
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