a+a-28=90

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Solution for a+a-28=90 equation:


Simplifying
a + a + -28 = 90

Reorder the terms:
-28 + a + a = 90

Combine like terms: a + a = 2a
-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 = 118
2a = 118

Divide each side by '2'.
a = 59

Simplifying
a = 59

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