0.25x+.15(20-x)=4.2

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Solution for 0.25x+.15(20-x)=4.2 equation:


Simplifying
0.25x + 0.15(20 + -1x) = 4.2
0.25x + (20 * 0.15 + -1x * 0.15) = 4.2
0.25x + (3 + -0.15x) = 4.2

Reorder the terms:
3 + 0.25x + -0.15x = 4.2

Combine like terms: 0.25x + -0.15x = 0.1x
3 + 0.1x = 4.2

Solving
3 + 0.1x = 4.2

Solving for variable 'x'.

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

Add '-3' to each side of the equation.
3 + -3 + 0.1x = 4.2 + -3

Combine like terms: 3 + -3 = 0
0 + 0.1x = 4.2 + -3
0.1x = 4.2 + -3

Combine like terms: 4.2 + -3 = 1.2
0.1x = 1.2

Divide each side by '0.1'.
x = 12

Simplifying
x = 12

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