21a-12=72

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Solution for 21a-12=72 equation: 


Simplifying
21a + -12 = 72

Reorder the terms:
-12 + 21a = 72

Solving
-12 + 21a = 72

Solving for variable 'a'.

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

Add '12' to each side of the equation.
-12 + 12 + 21a = 72 + 12

Combine like terms: -12 + 12 = 0
0 + 21a = 72 + 12
21a = 72 + 12

Combine like terms: 72 + 12 = 84
21a = 84

Divide each side by '21'.
a = 4

Simplifying
a = 4

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