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x in (-oo:+oo)
f^4 = (3/4)*x+2 // - (3/4)*x+2
f^4-((3/4)*x)-2 = 0
f^4+(-3/4)*x-2 = 0
f^4-3/4*x-2 = 0 // - f^4-2
-3/4*x = -(f^4-2) // : -3/4
x = (-(f^4-2))/(-3/4)
x = -4/3*(2-f^4)
x = -4/3*(2-f^4)
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