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42*y-(6*x)+(1.2*x)/y = 1.2/Y // - 1.2/Y
42*y-(1.2/Y)-(6*x)+(1.2*x)/y = 0
42*y-1.2*Y^-1-6*x+(1.2*x)/y = 0
1.2*x*y^-1-1.2*Y^-1+42*y = 0 // - 42*y-1.2*Y^-1
1.2*x*y^-1 = -(42*y-1.2*Y^-1) // : 1.2*y^-1
x = (-(42*y-1.2*Y^-1))/(1.2*y^-1)
x = -0.83333333*y*(42*y-1.2*Y^-1)
x = -0.83333333*y*(42*y-1.2*Y^-1)
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