a+7=-13-a

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Solution for a+7=-13-a equation: 


a in (-oo:+oo)

a+7 = -a-13 // + -a-13

a+a+7+13 = 0

2*a+20 = 0 // - 20

2*a = -20 // : 2

a = -20/2

a = -10

a = -10

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