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90=3(x+3)+(x+2)
We move all terms to the left:
90-(3(x+3)+(x+2))=0
We calculate terms in parentheses: -(3(x+3)+(x+2)), so:We get rid of parentheses
3(x+3)+(x+2)
We multiply parentheses
3x+(x+2)+9
We get rid of parentheses
3x+x+2+9
We add all the numbers together, and all the variables
4x+11
Back to the equation:
-(4x+11)
-4x-11+90=0
We add all the numbers together, and all the variables
-4x+79=0
We move all terms containing x to the left, all other terms to the right
-4x=-79
x=-79/-4
x=19+3/4
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