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x in (-oo:+oo)
(1/2)*x+(1/3)*y = 120 // - 120
(1/2)*x+(1/3)*y-120 = 0
1/2*x+1/3*y-120 = 0 // - 1/3*y-120
1/2*x = -(1/3*y-120) // : 1/2
x = (-(1/3*y-120))/1/2
x = 2*(120-(1/3*y))
x = 2*(120-(1/3*y))
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