9+5t=-t+21 - solution

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Solution for 9+5t=-t+21 equation:

t in (-oo:+oo)

5*t+9 = 21-t // - 21-t

5*t+t-21+9 = 0

6*t-12 = 0 // + 12

6*t = 12 // : 6

t = 12/6

t = 2

t = 2

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