-13-8-4a=-3

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Solution for -13-8-4a=-3 equation: 


Simplifying
-13 + -8 + -4a = -3

Combine like terms: -13 + -8 = -21
-21 + -4a = -3

Solving
-21 + -4a = -3

Solving for variable 'a'.

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

Add '21' to each side of the equation.
-21 + 21 + -4a = -3 + 21

Combine like terms: -21 + 21 = 0
0 + -4a = -3 + 21
-4a = -3 + 21

Combine like terms: -3 + 21 = 18
-4a = 18

Divide each side by '-4'.
a = -4.5

Simplifying
a = -4.5

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