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x in (-oo:+oo)
(1/4)*(x-4) = (1/15)*(4*x-1) // - (1/15)*(4*x-1)
(1/4)*(x-4)-((1/15)*(4*x-1)) = 0
(1/4)*(x-4)+(-1/15)*(4*x-1) = 0
1/4*(x-4)-1/15*(4*x-1) = 0
1/4*(x-4)-1/15*(4*x-1) = 0
-1/60*x-14/15 = 0
-1/60*x-14/15 = 0
-1/60*x-14/15 = 0 // + 14/15
-1/60*x = 14/15 // : -1/60
x = 14/15/(-1/60)
x = -56
x = -56
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