0.2x+0.8(20-x)=7

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Solution for 0.2x+0.8(20-x)=7 equation:


Simplifying
0.2x + 0.8(20 + -1x) = 7
0.2x + (20 * 0.8 + -1x * 0.8) = 7
0.2x + (16 + -0.8x) = 7

Reorder the terms:
16 + 0.2x + -0.8x = 7

Combine like terms: 0.2x + -0.8x = -0.6x
16 + -0.6x = 7

Solving
16 + -0.6x = 7

Solving for variable 'x'.

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

Add '-16' to each side of the equation.
16 + -16 + -0.6x = 7 + -16

Combine like terms: 16 + -16 = 0
0 + -0.6x = 7 + -16
-0.6x = 7 + -16

Combine like terms: 7 + -16 = -9
-0.6x = -9

Divide each side by '-0.6'.
x = 15

Simplifying
x = 15

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