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x in (-oo:+oo)
(4/5)*x-2 = -3 // + 3
(4/5)*x-2+3 = 0
4/5*x+1 = 0 // - 1
4/5*x = -1 // : 4/5
x = -1/4/5
x = -5/4
x = -5/4
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