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x in (-oo:+oo)
(1/4)*(12-(8*x)) = -3 // + 3
(1/4)*(12-(8*x))+3 = 0
(1/4)*(12-8*x)+3 = 0
1/4*(12-8*x)+3 = 0
1/4*(12-8*x)+3 = 0
6-2*x = 0
6-2*x = 0
6-2*x = 0 // - 6
-2*x = -6 // : -2
x = -6/(-2)
x = 3
x = 3
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