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x in (-oo:+oo)
x/4 = 3.89 // - 3.89
x/4-3.89 = 0
1/4*x-3.89 = 0 // + 3.89
1/4*x = 3.89 // : 1/4
x = 3.89/1/4
x = 15.56
x = 15.56
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