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x in (-oo:+oo)
2*y = x/10 // - x/10
2*y-(x/10) = 0
2*y-1/10*x = 0 // - 2*y
-1/10*x = -(2*y) // : -1/10
x = (-(2*y))/(-1/10)
x = 20*y
x = 20*y
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