1+3a=13

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Solution for 1+3a=13 equation: 


a in (-oo:+oo)

3*a+1 = 13 // - 13

3*a-13+1 = 0

3*a-12 = 0 // + 12

3*a = 12 // : 3

a = 12/3

a = 4

a = 4

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