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