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180=90+x+4x
We move all terms to the left:
180-(90+x+4x)=0
We add all the numbers together, and all the variables
-(5x+90)+180=0
We get rid of parentheses
-5x-90+180=0
We add all the numbers together, and all the variables
-5x+90=0
We move all terms containing x to the left, all other terms to the right
-5x=-90
x=-90/-5
x=+18
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