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x in (-oo:+oo)
(-3/2)*x = 21/2 // - 21/2
(-3/2)*x-(21/2) = 0
(-3/2)*x-21/2 = 0
-3/2*x-21/2 = 0 // + 21/2
-3/2*x = 21/2 // : -3/2
x = 21/2/(-3/2)
x = -7
x = -7
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