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x in (-oo:+oo)
(-4/5)*x = -2/15 // + -2/15
(-4/5)*x-(-2/15) = 0
(-4/5)*x+2/15 = 0
2/15-4/5*x = 0 // - 2/15
-4/5*x = -2/15 // : -4/5
x = -2/15/(-4/5)
x = 1/6
x = 1/6
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