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x in (-oo:+oo)
(3/5)*x+8 = (7/5)*x-8 // - (7/5)*x-8
(3/5)*x-((7/5)*x)+8+8 = 0
(3/5)*x+(-7/5)*x+8+8 = 0
16-4/5*x = 0 // - 16
-4/5*x = -16 // : -4/5
x = -16/(-4/5)
x = 20
x = 20
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