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x in (-oo:+oo)
(-1/2)*x^1+4*x+1 = 5 // - 5
(-1/2)*x^1+4*x-5+1 = 0
(-1/2)*x+4*x-5+1 = 0
7/2*x-4 = 0 // + 4
7/2*x = 4 // : 7/2
x = 4/7/2
x = 8/7
x = 8/7
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