21t+9=80

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Solution for 21t+9=80 equation: 


Simplifying
21t + 9 = 80

Reorder the terms:
9 + 21t = 80

Solving
9 + 21t = 80

Solving for variable 't'.

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

Add '-9' to each side of the equation.
9 + -9 + 21t = 80 + -9

Combine like terms: 9 + -9 = 0
0 + 21t = 80 + -9
21t = 80 + -9

Combine like terms: 80 + -9 = 71
21t = 71

Divide each side by '21'.
t = 3.380952381

Simplifying
t = 3.380952381

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