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x in (-oo:+oo)
(x+3)/4 = (3*x)/8 // - (3*x)/8
(x+3)/4-((3*x)/8) = 0
(x+3)/4+(-3/8)*x = 0
(x+3)/4+(-3*x)/8 = 0
(8*(x+3))/(4*8)+(-3*4*x)/(4*8) = 0
8*(x+3)-3*4*x = 0
24-4*x = 0
(24-4*x)/(4*8) = 0
(24-4*x)/(4*8) = 0 // * 4*8
24-4*x = 0
24-4*x = 0 // - 24
-4*x = -24 // : -4
x = -24/(-4)
x = 6
x = 6
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