if t+6=21, find the value of -2t

just need clarity on how to solve the problem
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2 Answers

t+6=21, so t=21-6=15

-2t=-2*t=-2*15=-30
by
t= 21-6

t= 15

so -2t= -2*15

= -30
by Level 1 User (220 points)

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