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x in (-oo:+oo)
y+9 = (7/2)*x-5 // - (7/2)*x-5
y-((7/2)*x)+5+9 = 0
(-7/2)*x+y+5+9 = 0
y-7/2*x+14 = 0 // - y+14
-7/2*x = -(y+14) // : -7/2
x = (-(y+14))/(-7/2)
x = 2/7*(y+14)
x = 2/7*(y+14)
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