28+2a=5+7

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Solution for 28+2a=5+7 equation: 


Simplifying
28 + 2a = 5 + 7

Combine like terms: 5 + 7 = 12
28 + 2a = 12

Solving
28 + 2a = 12

Solving for variable 'a'.

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

Add '-28' to each side of the equation.
28 + -28 + 2a = 12 + -28

Combine like terms: 28 + -28 = 0
0 + 2a = 12 + -28
2a = 12 + -28

Combine like terms: 12 + -28 = -16
2a = -16

Divide each side by '2'.
a = -8

Simplifying
a = -8

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