-13=4+a

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Solution for -13=4+a equation:


Simplifying
-13 = 4 + a

Solving
-13 = 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.
-13 + -1a = 4 + a + -1a

Combine like terms: a + -1a = 0
-13 + -1a = 4 + 0
-13 + -1a = 4

Add '13' to each side of the equation.
-13 + 13 + -1a = 4 + 13

Combine like terms: -13 + 13 = 0
0 + -1a = 4 + 13
-1a = 4 + 13

Combine like terms: 4 + 13 = 17
-1a = 17

Divide each side by '-1'.
a = -17

Simplifying
a = -17

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