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x in (-oo:+oo)
X-(x*(y/3))-(7*y) = 9 // - 9
X-(x*(y/3))-(7*y)-9 = 0
X-(x*(y/3))-7*y-9 = 0
X-1/3*x*y-7*y-9 = 0 // - X-7*y-9
-1/3*x*y = -(X-7*y-9) // : -1/3*y
x = (-(X-7*y-9))/(-1/3*y)
x = -3*y^-1*(9-X-(-7*y))
x = -3*y^-1*(9-X-(-7*y))
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