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180=90+(x+3)+(2x-18)
We move all terms to the left:
180-(90+(x+3)+(2x-18))=0
We calculate terms in parentheses: -(90+(x+3)+(2x-18)), so:We get rid of parentheses
90+(x+3)+(2x-18)
determiningTheFunctionDomain (x+3)+(2x-18)+90
We get rid of parentheses
x+2x+3-18+90
We add all the numbers together, and all the variables
3x+75
Back to the equation:
-(3x+75)
-3x-75+180=0
We add all the numbers together, and all the variables
-3x+105=0
We move all terms containing x to the left, all other terms to the right
-3x=-105
x=-105/-3
x=+35
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