21=-2t+9

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Solution for 21=-2t+9 equation:


Simplifying
21 = -2t + 9

Reorder the terms:
21 = 9 + -2t

Solving
21 = 9 + -2t

Solving for variable 't'.

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

Add '2t' to each side of the equation.
21 + 2t = 9 + -2t + 2t

Combine like terms: -2t + 2t = 0
21 + 2t = 9 + 0
21 + 2t = 9

Add '-21' to each side of the equation.
21 + -21 + 2t = 9 + -21

Combine like terms: 21 + -21 = 0
0 + 2t = 9 + -21
2t = 9 + -21

Combine like terms: 9 + -21 = -12
2t = -12

Divide each side by '2'.
t = -6

Simplifying
t = -6

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