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x in (-oo:+oo)
3/10 = (9/2)*x // - (9/2)*x
3/10-((9/2)*x) = 0
(-9/2)*x+3/10 = 0
3/10-9/2*x = 0 // - 3/10
-9/2*x = -3/10 // : -9/2
x = -3/10/(-9/2)
x = 1/15
x = 1/15
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