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x+15=1/2(30+(9x-42))
We move all terms to the left:
x+15-(1/2(30+(9x-42)))=0
Domain of the equation: 2(30+(9x-42)))!=0We multiply all the terms by the denominator
x∈R
x*2(30+(9x-42)))-(1+15*2(30+(9x-42)))=0
Wy multiply elements
2x^2(3+30x(3=0
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