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