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6*((1/2)*x+(2/3)*y) = 6*(-27/2) // - 6*(-27/2)
6*((1/2)*x+(2/3)*y)-(6*(-27/2)) = 0
6*((1/2)*x+(2/3)*y)+81 = 0
6*(1/2*x+2/3*y)+81 = 0
6*(1/2*x+2/3*y)+81 = 0
3*x+4*y+81 = 0
3*x+4*y+81 = 0
3*x+4*y+81 = 0 // - 4*y+81
3*x = -(4*y+81) // : 3
x = (-(4*y+81))/3
x = (-(4*y+81))/3
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