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30=2(x+3)+6x
We move all terms to the left:
30-(2(x+3)+6x)=0
We calculate terms in parentheses: -(2(x+3)+6x), so:We get rid of parentheses
2(x+3)+6x
We add all the numbers together, and all the variables
6x+2(x+3)
We multiply parentheses
6x+2x+6
We add all the numbers together, and all the variables
8x+6
Back to the equation:
-(8x+6)
-8x-6+30=0
We add all the numbers together, and all the variables
-8x+24=0
We move all terms containing x to the left, all other terms to the right
-8x=-24
x=-24/-8
x=+3
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