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90=(3x+38)+(9x+28)
We move all terms to the left:
90-((3x+38)+(9x+28))=0
We calculate terms in parentheses: -((3x+38)+(9x+28)), so:We get rid of parentheses
(3x+38)+(9x+28)
We get rid of parentheses
3x+9x+38+28
We add all the numbers together, and all the variables
12x+66
Back to the equation:
-(12x+66)
-12x-66+90=0
We add all the numbers together, and all the variables
-12x+24=0
We move all terms containing x to the left, all other terms to the right
-12x=-24
x=-24/-12
x=+2
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