21=8t-15t

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Solution for 21=8t-15t equation:


Simplifying
21 = 8t + -15t

Combine like terms: 8t + -15t = -7t
21 = -7t

Solving
21 = -7t

Solving for variable 't'.

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

Add '7t' to each side of the equation.
21 + 7t = -7t + 7t

Combine like terms: -7t + 7t = 0
21 + 7t = 0

Add '-21' to each side of the equation.
21 + -21 + 7t = 0 + -21

Combine like terms: 21 + -21 = 0
0 + 7t = 0 + -21
7t = 0 + -21

Combine like terms: 0 + -21 = -21
7t = -21

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

Simplifying
t = -3

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