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x in (-oo:+oo)
(5*x)/8 = (12*x)/7 // - (12*x)/7
(5*x)/8-((12*x)/7) = 0
(5*x)/8+(-12/7)*x = 0
-61/56*x = 0 // : -61/56
x = 0
x = 0
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