x+x(.40)=21

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Solution for x+x(.40)=21 equation: 


Simplifying
x + x(0.40) = 21

Reorder the terms for easier multiplication:
x + 0.40x = 21

Combine like terms: x + 0.40x = 1.4x
1.4x = 21

Solving
1.4x = 21

Solving for variable 'x'.

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

Divide each side by '1.4'.
x = 15

Simplifying
x = 15

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