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x in (-oo:+oo)
(7-x)/8 = 6*x // - 6*x
(7-x)/8-(6*x) = 0
(7-x)/8-6*x = 0
(7-x)/8+(-6*8*x)/8 = 0
7-x-6*8*x = 0
7-49*x = 0
(7-49*x)/8 = 0
(7-49*x)/8 = 0 // * 8
7-49*x = 0
7-49*x = 0 // - 7
-49*x = -7 // : -49
x = -7/(-49)
x = 1/7
x = 1/7
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