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x in (-oo:+oo)
189/20 = (3/2)*x // - (3/2)*x
189/20-((3/2)*x) = 0
(-3/2)*x+189/20 = 0
189/20-3/2*x = 0 // - 189/20
-3/2*x = -189/20 // : -3/2
x = -189/20/(-3/2)
x = 63/10
x = 63/10
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