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x in (-oo:+oo)
3/2-5*x = 5 // - 5
3/2-5*x-5 = 0
-5*x-7/2 = 0 // + 7/2
-5*x = 7/2 // : -5
x = 7/2/(-5)
x = -7/10
x = -7/10
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