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x in (-oo:+oo)
x/12+y/9 = 3552 // - 3552
x/12+y/9-3552 = 0
1/12*x+1/9*y-3552 = 0 // - 1/9*y-3552
1/12*x = -(1/9*y-3552) // : 1/12
x = (-(1/9*y-3552))/1/12
x = 12*(3552-(1/9*y))
x = 12*(3552-(1/9*y))
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