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