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