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x in (-oo:+oo)
(-2/3)*x = 15/5 // - 15/5
(-2/3)*x-(15/5) = 0
(-2/3)*x-3 = 0
-2/3*x-3 = 0 // + 3
-2/3*x = 3 // : -2/3
x = 3/(-2/3)
x = -9/2
x = -9/2
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