.40a+.35(20-a)=7.75

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Solution for .40a+.35(20-a)=7.75 equation:


Simplifying
0.40a + 0.35(20 + -1a) = 7.75
0.40a + (20 * 0.35 + -1a * 0.35) = 7.75
0.40a + (7 + -0.35a) = 7.75

Reorder the terms:
7 + 0.40a + -0.35a = 7.75

Combine like terms: 0.40a + -0.35a = 0.05a
7 + 0.05a = 7.75

Solving
7 + 0.05a = 7.75

Solving for variable 'a'.

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

Add '-7' to each side of the equation.
7 + -7 + 0.05a = 7.75 + -7

Combine like terms: 7 + -7 = 0
0 + 0.05a = 7.75 + -7
0.05a = 7.75 + -7

Combine like terms: 7.75 + -7 = 0.75
0.05a = 0.75

Divide each side by '0.05'.
a = 15

Simplifying
a = 15

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