57-6(a+4)=21

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Solution for 57-6(a+4)=21 equation:


Simplifying
57 + -6(a + 4) = 21

Reorder the terms:
57 + -6(4 + a) = 21
57 + (4 * -6 + a * -6) = 21
57 + (-24 + -6a) = 21

Combine like terms: 57 + -24 = 33
33 + -6a = 21

Solving
33 + -6a = 21

Solving for variable 'a'.

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

Add '-33' to each side of the equation.
33 + -33 + -6a = 21 + -33

Combine like terms: 33 + -33 = 0
0 + -6a = 21 + -33
-6a = 21 + -33

Combine like terms: 21 + -33 = -12
-6a = -12

Divide each side by '-6'.
a = 2

Simplifying
a = 2

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