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x in (-oo:+oo)
y = (-7/10)*x-7 // - (-7/10)*x-7
y-((-7/10)*x)+7 = 0
(7/10)*x+y+7 = 0
7/10*x+y+7 = 0 // - y+7
7/10*x = -(y+7) // : 7/10
x = (-(y+7))/7/10
x = -10/7*(y+7)
x = -10/7*(y+7)
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