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180=(2x-45)+x+(x+25)
We move all terms to the left:
180-((2x-45)+x+(x+25))=0
We calculate terms in parentheses: -((2x-45)+x+(x+25)), so:We get rid of parentheses
(2x-45)+x+(x+25)
We add all the numbers together, and all the variables
x+(2x-45)+(x+25)
We get rid of parentheses
x+2x+x-45+25
We add all the numbers together, and all the variables
4x-20
Back to the equation:
-(4x-20)
-4x+20+180=0
We add all the numbers together, and all the variables
-4x+200=0
We move all terms containing x to the left, all other terms to the right
-4x=-200
x=-200/-4
x=+50
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