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x in (-oo:+oo)
(17/15)*x-(1/5) = 4 // - 4
(17/15)*x-(1/5)-4 = 0
(17/15)*x-1/5-4 = 0
17/15*x-21/5 = 0 // + 21/5
17/15*x = 21/5 // : 17/15
x = 21/5/17/15
x = 63/17
x = 63/17
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