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x in (-oo:+oo)
(7/5)*x-(1/5) = 4 // - 4
(7/5)*x-(1/5)-4 = 0
(7/5)*x-1/5-4 = 0
7/5*x-21/5 = 0 // + 21/5
7/5*x = 21/5 // : 7/5
x = 21/5/7/5
x = 3
x = 3
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