.4t+21=15

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Solution for .4t+21=15 equation: 


Simplifying
0.4t + 21 = 15

Reorder the terms:
21 + 0.4t = 15

Solving
21 + 0.4t = 15

Solving for variable 't'.

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

Add '-21' to each side of the equation.
21 + -21 + 0.4t = 15 + -21

Combine like terms: 21 + -21 = 0
0 + 0.4t = 15 + -21
0.4t = 15 + -21

Combine like terms: 15 + -21 = -6
0.4t = -6

Divide each side by '0.4'.
t = -15

Simplifying
t = -15

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