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20*x+(4/3)*y = 15 // - 15
20*x+(4/3)*y-15 = 0
20*x+4/3*y-15 = 0 // - 4/3*y-15
20*x = -(4/3*y-15) // : 20
x = (-(4/3*y-15))/20
x = (15-(4/3*y))/20
x = (15-(4/3*y))/20
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