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x in (-oo:+oo)
(1/4)*x+3.1 = -19.1 // + 19.1
(1/4)*x+3.1+19.1 = 0
1/4*x+22.2 = 0 // - 22.2
1/4*x = -22.2 // : 1/4
x = -22.2/1/4
x = -88.8
x = -88.8
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