21=8t-5t

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Solution for 21=8t-5t equation:


Simplifying
21 = 8t + -5t

Combine like terms: 8t + -5t = 3t
21 = 3t

Solving
21 = 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 = 3t + -3t

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

Add '-21' to each side of the equation.
21 + -21 + -3t = 0 + -21

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

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

Divide each side by '-3'.
t = 7

Simplifying
t = 7

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