7-a=28

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Solution for 7-a=28 equation:


Simplifying
7 + -1a = 28

Solving
7 + -1a = 28

Solving for variable 'a'.

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

Add '-7' to each side of the equation.
7 + -7 + -1a = 28 + -7

Combine like terms: 7 + -7 = 0
0 + -1a = 28 + -7
-1a = 28 + -7

Combine like terms: 28 + -7 = 21
-1a = 21

Divide each side by '-1'.
a = -21

Simplifying
a = -21

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