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x in (-oo:+oo)
a = 10*(1/2)*x // - 10*(1/2)*x
a-(10*(1/2)*x) = 0
a-5*x = 0
a-5*x = 0 // - a
-5*x = -a // : -5
x = -a/(-5)
x = a/5
x = a/5
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