21=-5t-4

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Solution for 21=-5t-4 equation:


Simplifying
21 = -5t + -4

Reorder the terms:
21 = -4 + -5t

Solving
21 = -4 + -5t

Solving for variable 't'.

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

Add '5t' to each side of the equation.
21 + 5t = -4 + -5t + 5t

Combine like terms: -5t + 5t = 0
21 + 5t = -4 + 0
21 + 5t = -4

Add '-21' to each side of the equation.
21 + -21 + 5t = -4 + -21

Combine like terms: 21 + -21 = 0
0 + 5t = -4 + -21
5t = -4 + -21

Combine like terms: -4 + -21 = -25
5t = -25

Divide each side by '5'.
t = -5

Simplifying
t = -5

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