21a-12=84+13

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Solution for 21a-12=84+13 equation:


Simplifying
21a + -12 = 84 + 13

Reorder the terms:
-12 + 21a = 84 + 13

Combine like terms: 84 + 13 = 97
-12 + 21a = 97

Solving
-12 + 21a = 97

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 = 97 + 12

Combine like terms: -12 + 12 = 0
0 + 21a = 97 + 12
21a = 97 + 12

Combine like terms: 97 + 12 = 109
21a = 109

Divide each side by '21'.
a = 5.19047619

Simplifying
a = 5.19047619

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