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