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x in (-oo:+oo)
30*(5/2) = 2*x // - 2*x
30*(5/2)-(2*x) = 0
30*(5/2)-2*x = 0
75-2*x = 0 // - 75
-2*x = -75 // : -2
x = -75/(-2)
x = 75/2
x = 75/2
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