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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*(7-y)
x = 10/7*(7-y)
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