0.2t+0.3(40-t)=9.9

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Solution for 0.2t+0.3(40-t)=9.9 equation: 


Simplifying
0.2t + 0.3(40 + -1t) = 9.9
0.2t + (40 * 0.3 + -1t * 0.3) = 9.9
0.2t + (12 + -0.3t) = 9.9

Reorder the terms:
12 + 0.2t + -0.3t = 9.9

Combine like terms: 0.2t + -0.3t = -0.1t
12 + -0.1t = 9.9

Solving
12 + -0.1t = 9.9

Solving for variable 't'.

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

Add '-12' to each side of the equation.
12 + -12 + -0.1t = 9.9 + -12

Combine like terms: 12 + -12 = 0
0 + -0.1t = 9.9 + -12
-0.1t = 9.9 + -12

Combine like terms: 9.9 + -12 = -2.1
-0.1t = -2.1

Divide each side by '-0.1'.
t = 21

Simplifying
t = 21

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