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180=25x+20x
We move all terms to the left:
180-(25x+20x)=0
We add all the numbers together, and all the variables
-(+45x)+180=0
We get rid of parentheses
-45x+180=0
We move all terms containing x to the left, all other terms to the right
-45x=-180
x=-180/-45
x=+4
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