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5x+9=2(3x+4)
We move all terms to the left:
5x+9-(2(3x+4))=0
We calculate terms in parentheses: -(2(3x+4)), so:We get rid of parentheses
2(3x+4)
We multiply parentheses
6x+8
Back to the equation:
-(6x+8)
5x-6x-8+9=0
We add all the numbers together, and all the variables
-1x+1=0
We move all terms containing x to the left, all other terms to the right
-x=-1
x=-1/-1
x=1
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