0.4+3(1.2t+0.9)=21.1

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Solution for 0.4+3(1.2t+0.9)=21.1 equation: 


Simplifying
0.4 + 3(1.2t + 0.9) = 21.1

Reorder the terms:
0.4 + 3(0.9 + 1.2t) = 21.1
0.4 + (0.9 * 3 + 1.2t * 3) = 21.1
0.4 + (2.7 + 3.6t) = 21.1

Combine like terms: 0.4 + 2.7 = 3.1
3.1 + 3.6t = 21.1

Solving
3.1 + 3.6t = 21.1

Solving for variable 't'.

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

Add '-3.1' to each side of the equation.
3.1 + -3.1 + 3.6t = 21.1 + -3.1

Combine like terms: 3.1 + -3.1 = 0.0
0.0 + 3.6t = 21.1 + -3.1
3.6t = 21.1 + -3.1

Combine like terms: 21.1 + -3.1 = 18
3.6t = 18

Divide each side by '3.6'.
t = 5

Simplifying
t = 5

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