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x in (-oo:+oo)
(5*x)/8 = 6*x-(7/3) // - 6*x-(7/3)
(5*x)/8-(6*x)+7/3 = 0
(5*x)/8-6*x+7/3 = 0
7/3-43/8*x = 0 // - 7/3
-43/8*x = -7/3 // : -43/8
x = -7/3/(-43/8)
x = 56/129
x = 56/129
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