13=-z/2 - solution

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Solution for 13=-z/2 equation:

z in (-oo:+oo)

13 = -z/2 // + -z/2

13-(-z/2) = 0

(1/2)*z+13 = 0

1/2*z+13 = 0 // - 13

1/2*z = -13 // : 1/2

z = -13/1/2

z = -26

z = -26

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