-21=5t+7t-9

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Solution for -21=5t+7t-9 equation: 


t in (-oo:+oo)

-21 = 5*t+7*t-9 // - 5*t+7*t-9

9-(5*t)-(7*t)-21 = 0

9-5*t-7*t-21 = 0

-12*t-12 = 0 // + 12

-12*t = 12 // : -12

t = 12/(-12)

t = -1

t = -1

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