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