8t-21=9+4t

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Solution for 8t-21=9+4t equation:


Simplifying
8t + -21 = 9 + 4t

Reorder the terms:
-21 + 8t = 9 + 4t

Solving
-21 + 8t = 9 + 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 + 8t + -4t = 9 + 4t + -4t

Combine like terms: 8t + -4t = 4t
-21 + 4t = 9 + 4t + -4t

Combine like terms: 4t + -4t = 0
-21 + 4t = 9 + 0
-21 + 4t = 9

Add '21' to each side of the equation.
-21 + 21 + 4t = 9 + 21

Combine like terms: -21 + 21 = 0
0 + 4t = 9 + 21
4t = 9 + 21

Combine like terms: 9 + 21 = 30
4t = 30

Divide each side by '4'.
t = 7.5

Simplifying
t = 7.5

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