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x in (-oo:+oo)
2/3-(5*x) = 12/5 // - 12/5
2/3-(5*x)-(12/5) = 0
2/3-5*x-12/5 = 0
-5*x-26/15 = 0 // + 26/15
-5*x = 26/15 // : -5
x = 26/15/(-5)
x = -26/75
x = -26/75
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