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