8+7a=-13 - solution

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Solution for 8+7a=-13 equation:

a in (-oo:+oo)

7*a+8 = -13 // + 13

7*a+8+13 = 0

7*a+21 = 0 // - 21

7*a = -21 // : 7

a = -21/7

a = -3

a = -3

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