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15x=30(x+300)
We move all terms to the left:
15x-(30(x+300))=0
We calculate terms in parentheses: -(30(x+300)), so:We get rid of parentheses
30(x+300)
We multiply parentheses
30x+9000
Back to the equation:
-(30x+9000)
15x-30x-9000=0
We add all the numbers together, and all the variables
-15x-9000=0
We move all terms containing x to the left, all other terms to the right
-15x=9000
x=9000/-15
x=-600
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