19a-12-4a=-57

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


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

Reorder the terms:
-12 + 19a + -4a = -57

Combine like terms: 19a + -4a = 15a
-12 + 15a = -57

Solving
-12 + 15a = -57

Solving for variable 'a'.

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

Add '12' to each side of the equation.
-12 + 12 + 15a = -57 + 12

Combine like terms: -12 + 12 = 0
0 + 15a = -57 + 12
15a = -57 + 12

Combine like terms: -57 + 12 = -45
15a = -45

Divide each side by '15'.
a = -3

Simplifying
a = -3

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