21=1+4t

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Solution for 21=1+4t equation: 


Simplifying
21 = 1 + 4t

Solving
21 = 1 + 4t

Solving for variable 't'.

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

Add '-4t' to each side of the equation.
21 + -4t = 1 + 4t + -4t

Combine like terms: 4t + -4t = 0
21 + -4t = 1 + 0
21 + -4t = 1

Add '-21' to each side of the equation.
21 + -21 + -4t = 1 + -21

Combine like terms: 21 + -21 = 0
0 + -4t = 1 + -21
-4t = 1 + -21

Combine like terms: 1 + -21 = -20
-4t = -20

Divide each side by '-4'.
t = 5

Simplifying
t = 5

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