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180=90+(3x+30)+x
We move all terms to the left:
180-(90+(3x+30)+x)=0
We calculate terms in parentheses: -(90+(3x+30)+x), so:We get rid of parentheses
90+(3x+30)+x
determiningTheFunctionDomain (3x+30)+x+90
We add all the numbers together, and all the variables
x+(3x+30)+90
We get rid of parentheses
x+3x+30+90
We add all the numbers together, and all the variables
4x+120
Back to the equation:
-(4x+120)
-4x-120+180=0
We add all the numbers together, and all the variables
-4x+60=0
We move all terms containing x to the left, all other terms to the right
-4x=-60
x=-60/-4
x=+15
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