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90+1(180-4x)+x=180
We move all terms to the left:
90+1(180-4x)+x-(180)=0
We add all the numbers together, and all the variables
1(-4x+180)+x+90-180=0
We add all the numbers together, and all the variables
x+1(-4x+180)-90=0
We move all terms containing x to the left, all other terms to the right
x+1(-4x+180)=90
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