0=3t+21

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Solution for 0=3t+21 equation: 


Simplifying
0 = 3t + 21

Reorder the terms:
0 = 21 + 3t

Solving
0 = 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.
0 + -3t = 21 + 3t + -3t
Remove the zero:
-3t = 21 + 3t + -3t

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

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

Simplifying
t = -7

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