28-2a=90

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Solution for 28-2a=90 equation: 


Simplifying
28 + -2a = 90

Solving
28 + -2a = 90

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 = 90 + -28

Combine like terms: 28 + -28 = 0
0 + -2a = 90 + -28
-2a = 90 + -28

Combine like terms: 90 + -28 = 62
-2a = 62

Divide each side by '-2'.
a = -31

Simplifying
a = -31

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