-3t=9-21

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Solution for -3t=9-21 equation: 


Simplifying
-3t = 9 + -21

Combine like terms: 9 + -21 = -12
-3t = -12

Solving
-3t = -12

Solving for variable 't'.

Move all terms containing t to the left, all other terms to the right.

Divide each side by '-3'.
t = 4

Simplifying
t = 4

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