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x in (-oo:+oo)
(-5/4)*x = 12 // - 12
(-5/4)*x-12 = 0
-5/4*x-12 = 0 // + 12
-5/4*x = 12 // : -5/4
x = 12/(-5/4)
x = -48/5
x = -48/5
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