3+1/2a=-1

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Solution for 3+1/2a=-1 equation: 


a in (-oo:+oo)

(1/2)*a+3 = -1 // + 1

(1/2)*a+1+3 = 0

1/2*a+4 = 0 // - 4

1/2*a = -4 // : 1/2

a = -4/1/2

a = -8

a = -8

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