3+7a=-18

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Solution for 3+7a=-18 equation: 


a in (-oo:+oo)

7*a+3 = -18 // + 18

7*a+3+18 = 0

7*a+21 = 0 // - 21

7*a = -21 // : 7

a = -21/7

a = -3

a = -3

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