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x in (-oo:+oo)
y = (-7/9)*x+50 // - (-7/9)*x+50
y-((-7/9)*x)-50 = 0
(7/9)*x+y-50 = 0
7/9*x+y-50 = 0 // - y-50
7/9*x = -(y-50) // : 7/9
x = (-(y-50))/7/9
x = 9/7*(50-y)
x = 9/7*(50-y)
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