21=3(t+4)

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Solution for 21=3(t+4) equation:


Simplifying
21 = 3(t + 4)

Reorder the terms:
21 = 3(4 + t)
21 = (4 * 3 + t * 3)
21 = (12 + 3t)

Solving
21 = 12 + 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 = 12 + 3t + -3t

Combine like terms: 3t + -3t = 0
21 + -3t = 12 + 0
21 + -3t = 12

Add '-21' to each side of the equation.
21 + -21 + -3t = 12 + -21

Combine like terms: 21 + -21 = 0
0 + -3t = 12 + -21
-3t = 12 + -21

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

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

Simplifying
t = 3

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