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x in (-oo:+oo)
(8-(7*x))/4 = 6*x // - 6*x
(8-(7*x))/4-(6*x) = 0
(8-7*x)/4-6*x = 0
(8-7*x)/4+(-6*4*x)/4 = 0
8-7*x-6*4*x = 0
8-31*x = 0
(8-31*x)/4 = 0
(8-31*x)/4 = 0 // * 4
8-31*x = 0
8-31*x = 0 // - 8
-31*x = -8 // : -31
x = -8/(-31)
x = 8/31
x = 8/31
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