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x in (-oo:+oo)
(-15/2)*x = 21/4 // - 21/4
(-15/2)*x-(21/4) = 0
(-15/2)*x-21/4 = 0
-15/2*x-21/4 = 0 // + 21/4
-15/2*x = 21/4 // : -15/2
x = 21/4/(-15/2)
x = -7/10
x = -7/10
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