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x in (-oo:+oo)
(15/28)*x = 9/10 // - 9/10
(15/28)*x-(9/10) = 0
(15/28)*x-9/10 = 0
15/28*x-9/10 = 0 // + 9/10
15/28*x = 9/10 // : 15/28
x = 9/10/15/28
x = 42/25
x = 42/25
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