7a+12=21+a

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Solution for 7a+12=21+a equation:


Simplifying
7a + 12 = 21 + a

Reorder the terms:
12 + 7a = 21 + a

Solving
12 + 7a = 21 + a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
12 + 7a + -1a = 21 + a + -1a

Combine like terms: 7a + -1a = 6a
12 + 6a = 21 + a + -1a

Combine like terms: a + -1a = 0
12 + 6a = 21 + 0
12 + 6a = 21

Add '-12' to each side of the equation.
12 + -12 + 6a = 21 + -12

Combine like terms: 12 + -12 = 0
0 + 6a = 21 + -12
6a = 21 + -12

Combine like terms: 21 + -12 = 9
6a = 9

Divide each side by '6'.
a = 1.5

Simplifying
a = 1.5

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