a+.75a=21

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Solution for a+.75a=21 equation: 


Simplifying
a + 0.75a = 21

Combine like terms: a + 0.75a = 1.75a
1.75a = 21

Solving
1.75a = 21

Solving for variable 'a'.

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

Divide each side by '1.75'.
a = 12

Simplifying
a = 12

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