9=a-4

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Solution for 9=a-4 equation:


Simplifying
9 = a + -4

Reorder the terms:
9 = -4 + a

Solving
9 = -4 + 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.
9 + -1a = -4 + a + -1a

Combine like terms: a + -1a = 0
9 + -1a = -4 + 0
9 + -1a = -4

Add '-9' to each side of the equation.
9 + -9 + -1a = -4 + -9

Combine like terms: 9 + -9 = 0
0 + -1a = -4 + -9
-1a = -4 + -9

Combine like terms: -4 + -9 = -13
-1a = -13

Divide each side by '-1'.
a = 13

Simplifying
a = 13

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