21=9+3t

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Solution for 21=9+3t equation: 


Simplifying
21 = 9 + 3t

Solving
21 = 9 + 3t

Solving for variable 't'.

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

Add '-3t' to each side of the equation.
21 + -3t = 9 + 3t + -3t

Combine like terms: 3t + -3t = 0
21 + -3t = 9 + 0
21 + -3t = 9

Add '-21' to each side of the equation.
21 + -21 + -3t = 9 + -21

Combine like terms: 21 + -21 = 0
0 + -3t = 9 + -21
-3t = 9 + -21

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

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

Simplifying
t = 4

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