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x in (-oo:+oo)
(3/5)*x+2/3 = 4*x+316/15 // - 4*x+316/15
(3/5)*x-(4*x)+2/3-(316/15) = 0
(3/5)*x-4*x+2/3-316/15 = 0
-17/5*x-102/5 = 0 // + 102/5
-17/5*x = 102/5 // : -17/5
x = 102/5/(-17/5)
x = -6
x = -6
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