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x in (-oo:+oo)
(1/4)*(4*x-48) = 4*x // - 4*x
(1/4)*(4*x-48)-(4*x) = 0
(1/4)*(4*x-48)-4*x = 0
1/4*(4*x-48)-4*x = 0
1/4*(4*x-48)-4*x = 0
-3*x-12 = 0
-3*x-12 = 0
-3*x-12 = 0 // + 12
-3*x = 12 // : -3
x = 12/(-3)
x = -4
x = -4
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