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x in (-oo:+oo)
(14*x)/d+y/d = 7 // - 7
(14*x)/d+y/d-7 = 0
14*d^-1*x+d^-1*y-7 = 0 // - d^-1*y-7
14*d^-1*x = -(d^-1*y-7) // : 14*d^-1
x = (-(d^-1*y-7))/(14*d^-1)
x = (7-(d^-1*y))/(14*d^-1)
x = (7-(d^-1*y))/(14*d^-1)
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