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x in (-oo:+oo)
(-4/7)*(x-(10*y))-((1/14)*x) = 0
(-4/7)*(x-10*y)+(-1/14)*x = 0
-4/7*(x-10*y)-x/14 = 0
(-4/7*14*(x-10*y))/14-x/14 = 0
-4/7*14*(x-10*y)-x = 0
80*y-9*x = 0
(80*y-9*x)/14 = 0
(80*y-9*x)/14 = 0 // * 14
80*y-9*x = 0
80*y-9*x = 0 // - 80*y
-9*x = -(80*y) // : -9
x = (-(80*y))/(-9)
x = (-80*y)/(-9)
x = (-80*y)/(-9)
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