21a-28=12a+3

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Solution for 21a-28=12a+3 equation:


Simplifying
21a + -28 = 12a + 3

Reorder the terms:
-28 + 21a = 12a + 3

Reorder the terms:
-28 + 21a = 3 + 12a

Solving
-28 + 21a = 3 + 12a

Solving for variable 'a'.

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

Add '-12a' to each side of the equation.
-28 + 21a + -12a = 3 + 12a + -12a

Combine like terms: 21a + -12a = 9a
-28 + 9a = 3 + 12a + -12a

Combine like terms: 12a + -12a = 0
-28 + 9a = 3 + 0
-28 + 9a = 3

Add '28' to each side of the equation.
-28 + 28 + 9a = 3 + 28

Combine like terms: -28 + 28 = 0
0 + 9a = 3 + 28
9a = 3 + 28

Combine like terms: 3 + 28 = 31
9a = 31

Divide each side by '9'.
a = 3.444444444

Simplifying
a = 3.444444444

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