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x in (-oo:+oo)
(-2/3)*x = 4/5 // - 4/5
(-2/3)*x-(4/5) = 0
(-2/3)*x-4/5 = 0
-2/3*x-4/5 = 0 // + 4/5
-2/3*x = 4/5 // : -2/3
x = 4/5/(-2/3)
x = -6/5
x = -6/5
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