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x in (-oo:+oo)
4*e^4-(x/4)+4+8 = 12 // - 12
4*e^4-(x/4)-12+4+8 = 0
4*e^4-1/4*x = 0 // - 4*e^4
-1/4*x = -(4*e^4) // : -1/4
x = (-(4*e^4))/(-1/4)
x = 16*e^4
x = 16*e^4
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