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x in (-oo:+oo)
a = 30*(1/2)*x // - 30*(1/2)*x
a-(30*(1/2)*x) = 0
a-15*x = 0
a-15*x = 0 // - a
-15*x = -a // : -15
x = -a/(-15)
x = a/15
x = a/15
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