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x in (-oo:+oo)
(4/7)*x = y-3 // - y-3
(4/7)*x-y+3 = 0
4/7*x-y+3 = 0 // - 3-y
4/7*x = -(3-y) // : 4/7
x = (-(3-y))/4/7
x = 7/4*(y-3)
x = 7/4*(y-3)
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