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90-x/2=180-4x
We move all terms to the left:
90-x/2-(180-4x)=0
We add all the numbers together, and all the variables
-x/2-(-4x+180)+90=0
We get rid of parentheses
-x/2+4x-180+90=0
We multiply all the terms by the denominator
-x+4x*2-180*2+90*2=0
We add all the numbers together, and all the variables
-1x+4x*2-180=0
Wy multiply elements
-1x+8x-180=0
We add all the numbers together, and all the variables
7x-180=0
We move all terms containing x to the left, all other terms to the right
7x=180
x=180/7
x=25+5/7
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