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X/2+x/3-15 = 0
1/2*X+1/3*x-15 = 0 // - 1/2*X-15
1/3*x = -(1/2*X-15) // : 1/3
x = (-(1/2*X-15))/1/3
x = 3*(15-(1/2*X))
x = 3*(15-(1/2*X))
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