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x in (-oo:+oo)
(4/5)*x = 18/25 // - 18/25
(4/5)*x-(18/25) = 0
(4/5)*x-18/25 = 0
4/5*x-18/25 = 0 // + 18/25
4/5*x = 18/25 // : 4/5
x = 18/25/4/5
x = 9/10
x = 9/10
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