x-.3x=21

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Solution for x-.3x=21 equation: 


Simplifying
x + -0.3x = 21

Combine like terms: x + -0.3x = 0.7x
0.7x = 21

Solving
0.7x = 21

Solving for variable 'x'.

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

Divide each side by '0.7'.
x = 30

Simplifying
x = 30

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