0.4+0.25(91-x)=28.21

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Solution for 0.4+0.25(91-x)=28.21 equation: 


Simplifying
0.4 + 0.25(91 + -1x) = 28.21
0.4 + (91 * 0.25 + -1x * 0.25) = 28.21
0.4 + (22.75 + -0.25x) = 28.21

Combine like terms: 0.4 + 22.75 = 23.15
23.15 + -0.25x = 28.21

Solving
23.15 + -0.25x = 28.21

Solving for variable 'x'.

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

Add '-23.15' to each side of the equation.
23.15 + -23.15 + -0.25x = 28.21 + -23.15

Combine like terms: 23.15 + -23.15 = 0.00
0.00 + -0.25x = 28.21 + -23.15
-0.25x = 28.21 + -23.15

Combine like terms: 28.21 + -23.15 = 5.06
-0.25x = 5.06

Divide each side by '-0.25'.
x = -20.24

Simplifying
x = -20.24

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