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x in (-oo:+oo)
(2/5)*x-1 = 7/5 // - 7/5
(2/5)*x-(7/5)-1 = 0
(2/5)*x-7/5-1 = 0
2/5*x-12/5 = 0 // + 12/5
2/5*x = 12/5 // : 2/5
x = 12/5/2/5
x = 6
x = 6
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