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x in (-oo:+oo)
5*x+1/4 = -79/4 // + -79/4
5*x+1/4-(-79/4) = 0
5*x+1/4+79/4 = 0
5*x+20 = 0 // - 20
5*x = -20 // : 5
x = -20/5
x = -4
x = -4
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