(a+3.9)/1=8.9

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Solution for (a+3.9)/1=8.9 equation: 


a in (-oo:+oo)

(a+3.9)/1 = 8.9 // - 8.9

(a+3.9)/1-8.9 = 0

a-8.9+3.9 = 0

a-5 = 0 // + 5

a = 5

a = 5

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