21=4+t

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Solution for 21=4+t equation:


Simplifying
21 = 4 + t

Solving
21 = 4 + t

Solving for variable 't'.

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

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

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

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

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

Combine like terms: 4 + -21 = -17
-1t = -17

Divide each side by '-1'.
t = 17

Simplifying
t = 17

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