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15x=5(2x+4)
We move all terms to the left:
15x-(5(2x+4))=0
We calculate terms in parentheses: -(5(2x+4)), so:We get rid of parentheses
5(2x+4)
We multiply parentheses
10x+20
Back to the equation:
-(10x+20)
15x-10x-20=0
We add all the numbers together, and all the variables
5x-20=0
We move all terms containing x to the left, all other terms to the right
5x=20
x=20/5
x=4
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