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x in (-oo:+oo)
(1/2)*x+(1/3)*y = 28 // - 28
(1/2)*x+(1/3)*y-28 = 0
1/2*x+1/3*y-28 = 0 // - 1/3*y-28
1/2*x = -(1/3*y-28) // : 1/2
x = (-(1/3*y-28))/1/2
x = 2*(28-(1/3*y))
x = 2*(28-(1/3*y))
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