7=-u/2 - solution

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Solution for 7=-u/2 equation:

u in (-oo:+oo)

7 = -u/2 // + -u/2

7-(-u/2) = 0

(1/2)*u+7 = 0

1/2*u+7 = 0 // - 7

1/2*u = -7 // : 1/2

u = -7/1/2

u = -14

u = -14

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