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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
y-7/10*x-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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