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x in (-oo:+oo)
3/2 = (9/10)*x // - (9/10)*x
3/2-((9/10)*x) = 0
(-9/10)*x+3/2 = 0
3/2-9/10*x = 0 // - 3/2
-9/10*x = -3/2 // : -9/10
x = -3/2/(-9/10)
x = 5/3
x = 5/3
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