3a-21=54+12a

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Solution for 3a-21=54+12a equation:


Simplifying
3a + -21 = 54 + 12a

Reorder the terms:
-21 + 3a = 54 + 12a

Solving
-21 + 3a = 54 + 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.
-21 + 3a + -12a = 54 + 12a + -12a

Combine like terms: 3a + -12a = -9a
-21 + -9a = 54 + 12a + -12a

Combine like terms: 12a + -12a = 0
-21 + -9a = 54 + 0
-21 + -9a = 54

Add '21' to each side of the equation.
-21 + 21 + -9a = 54 + 21

Combine like terms: -21 + 21 = 0
0 + -9a = 54 + 21
-9a = 54 + 21

Combine like terms: 54 + 21 = 75
-9a = 75

Divide each side by '-9'.
a = -8.333333333

Simplifying
a = -8.333333333

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