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x in (-oo:+oo)
(1/4)*(4*x-12)+5 = 4*x+8 // - 4*x+8
(1/4)*(4*x-12)-(4*x)-8+5 = 0
(1/4)*(4*x-12)-4*x-8+5 = 0
1/4*(4*x-12)-4*x-8+5 = 0
1/4*(4*x-12)-4*x-8+5 = 0
5-3*x-8-3 = 0
5-3*x-11 = 0
-3*x-6 = 0
-3*x-6 = 0
-3*x-6 = 0 // + 6
-3*x = 6 // : -3
x = 6/(-3)
x = -2
x = -2
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