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x in (-oo:+oo)
(-2/3)*x = -5/2 // + -5/2
(-2/3)*x-(-5/2) = 0
(-2/3)*x+5/2 = 0
5/2-2/3*x = 0 // - 5/2
-2/3*x = -5/2 // : -2/3
x = -5/2/(-2/3)
x = 15/4
x = 15/4
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