21=15t-39

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Solution for 21=15t-39 equation:


Simplifying
21 = 15t + -39

Reorder the terms:
21 = -39 + 15t

Solving
21 = -39 + 15t

Solving for variable 't'.

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

Add '-15t' to each side of the equation.
21 + -15t = -39 + 15t + -15t

Combine like terms: 15t + -15t = 0
21 + -15t = -39 + 0
21 + -15t = -39

Add '-21' to each side of the equation.
21 + -21 + -15t = -39 + -21

Combine like terms: 21 + -21 = 0
0 + -15t = -39 + -21
-15t = -39 + -21

Combine like terms: -39 + -21 = -60
-15t = -60

Divide each side by '-15'.
t = 4

Simplifying
t = 4

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