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x in (-oo:+oo)
(2/5)*x+8 = (17/5)*x-13 // - (17/5)*x-13
(2/5)*x-((17/5)*x)+8+13 = 0
(2/5)*x+(-17/5)*x+8+13 = 0
21-3*x = 0 // - 21
-3*x = -21 // : -3
x = -21/(-3)
x = 7
x = 7
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