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x in (-oo:+oo)
x/(-5) = -2/3 // + -2/3
x/(-5)-(-2/3) = 0
x/(-5)+2/3 = 0
2/3-1/5*x = 0 // - 2/3
-1/5*x = -2/3 // : -1/5
x = -2/3/(-1/5)
x = 10/3
x = 10/3
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