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x in (-oo:+oo)
(4/5)*x-(4/5) = -22/15 // + -22/15
(4/5)*x-(4/5)-(-22/15) = 0
(4/5)*x-4/5+22/15 = 0
4/5*x+2/3 = 0 // - 2/3
4/5*x = -2/3 // : 4/5
x = -2/3/4/5
x = -5/6
x = -5/6
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