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x in (-oo:+oo)
y = (7/5)*x-(10/7) // - (7/5)*x-(10/7)
y-((7/5)*x)+10/7 = 0
(-7/5)*x+y+10/7 = 0
y-7/5*x+10/7 = 0 // - y+10/7
-7/5*x = -(y+10/7) // : -7/5
x = (-(y+10/7))/(-7/5)
x = 5/7*(y+10/7)
x = 5/7*(y+10/7)
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