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x in (-oo:+oo)
(-3/2)*x = 7 // - 7
(-3/2)*x-7 = 0
-3/2*x-7 = 0 // + 7
-3/2*x = 7 // : -3/2
x = 7/(-3/2)
x = -14/3
x = -14/3
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