12-a=15-7a

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Solution for 12-a=15-7a equation:


Simplifying
12 + -1a = 15 + -7a

Solving
12 + -1a = 15 + -7a

Solving for variable 'a'.

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

Add '7a' to each side of the equation.
12 + -1a + 7a = 15 + -7a + 7a

Combine like terms: -1a + 7a = 6a
12 + 6a = 15 + -7a + 7a

Combine like terms: -7a + 7a = 0
12 + 6a = 15 + 0
12 + 6a = 15

Add '-12' to each side of the equation.
12 + -12 + 6a = 15 + -12

Combine like terms: 12 + -12 = 0
0 + 6a = 15 + -12
6a = 15 + -12

Combine like terms: 15 + -12 = 3
6a = 3

Divide each side by '6'.
a = 0.5

Simplifying
a = 0.5

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