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x in (-oo:+oo)
y = (7/5)*x-25 // - (7/5)*x-25
y-((7/5)*x)+25 = 0
(-7/5)*x+y+25 = 0
y-7/5*x+25 = 0 // - y+25
-7/5*x = -(y+25) // : -7/5
x = (-(y+25))/(-7/5)
x = 5/7*(y+25)
x = 5/7*(y+25)
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