.25(20-x)+.05x=3.20

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Solution for .25(20-x)+.05x=3.20 equation:


Simplifying
0.25(20 + -1x) + 0.05x = 3.20
(20 * 0.25 + -1x * 0.25) + 0.05x = 3.20
(5 + -0.25x) + 0.05x = 3.20

Combine like terms: -0.25x + 0.05x = -0.2x
5 + -0.2x = 3.20

Solving
5 + -0.2x = 3.20

Solving for variable 'x'.

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

Add '-5' to each side of the equation.
5 + -5 + -0.2x = 3.20 + -5

Combine like terms: 5 + -5 = 0
0 + -0.2x = 3.20 + -5
-0.2x = 3.20 + -5

Combine like terms: 3.20 + -5 = -1.8
-0.2x = -1.8

Divide each side by '-0.2'.
x = 9

Simplifying
x = 9

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