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x in (-oo:+oo)
3*x = 7*x-(3/2) // - 7*x-(3/2)
3*x-(7*x)+3/2 = 0
3*x-7*x+3/2 = 0
3/2-4*x = 0 // - 3/2
-4*x = -3/2 // : -4
x = -3/2/(-4)
x = 3/8
x = 3/8
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