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180=(2x)+(90+x)+(3x)
We move all terms to the left:
180-((2x)+(90+x)+(3x))=0
We add all the numbers together, and all the variables
-(2x+(x+90)+3x)+180=0
We calculate terms in parentheses: -(2x+(x+90)+3x), so:We get rid of parentheses
2x+(x+90)+3x
We add all the numbers together, and all the variables
5x+(x+90)
We get rid of parentheses
5x+x+90
We add all the numbers together, and all the variables
6x+90
Back to the equation:
-(6x+90)
-6x-90+180=0
We add all the numbers together, and all the variables
-6x+90=0
We move all terms containing x to the left, all other terms to the right
-6x=-90
x=-90/-6
x=+15
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