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x in (-oo:+oo)
(8/7)*x-(2/5) = 1/10 // - 1/10
(8/7)*x-(2/5)-(1/10) = 0
(8/7)*x-2/5-1/10 = 0
8/7*x-1/2 = 0 // + 1/2
8/7*x = 1/2 // : 8/7
x = 1/2/8/7
x = 7/16
x = 7/16
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