0.25+0.15(100-x)=21

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Solution for 0.25+0.15(100-x)=21 equation: 


Simplifying
0.25 + 0.15(100 + -1x) = 21
0.25 + (100 * 0.15 + -1x * 0.15) = 21
0.25 + (15 + -0.15x) = 21

Combine like terms: 0.25 + 15 = 15.25
15.25 + -0.15x = 21

Solving
15.25 + -0.15x = 21

Solving for variable 'x'.

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

Add '-15.25' to each side of the equation.
15.25 + -15.25 + -0.15x = 21 + -15.25

Combine like terms: 15.25 + -15.25 = 0.00
0.00 + -0.15x = 21 + -15.25
-0.15x = 21 + -15.25

Combine like terms: 21 + -15.25 = 5.75
-0.15x = 5.75

Divide each side by '-0.15'.
x = -38.33333333

Simplifying
x = -38.33333333

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