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