19-12-4a=-57

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Solution for 19-12-4a=-57 equation: 


Simplifying
19 + -12 + -4a = -57

Combine like terms: 19 + -12 = 7
7 + -4a = -57

Solving
7 + -4a = -57

Solving for variable 'a'.

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

Add '-7' to each side of the equation.
7 + -7 + -4a = -57 + -7

Combine like terms: 7 + -7 = 0
0 + -4a = -57 + -7
-4a = -57 + -7

Combine like terms: -57 + -7 = -64
-4a = -64

Divide each side by '-4'.
a = 16

Simplifying
a = 16

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