-28=-17+a

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Solution for -28=-17+a equation:


Simplifying
-28 = -17 + a

Solving
-28 = -17 + a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
-28 + -1a = -17 + a + -1a

Combine like terms: a + -1a = 0
-28 + -1a = -17 + 0
-28 + -1a = -17

Add '28' to each side of the equation.
-28 + 28 + -1a = -17 + 28

Combine like terms: -28 + 28 = 0
0 + -1a = -17 + 28
-1a = -17 + 28

Combine like terms: -17 + 28 = 11
-1a = 11

Divide each side by '-1'.
a = -11

Simplifying
a = -11

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