-3(2+a)=-21

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Solution for -3(2+a)=-21 equation: 


Simplifying
-3(2 + a) = -21
(2 * -3 + a * -3) = -21
(-6 + -3a) = -21

Solving
-6 + -3a = -21

Solving for variable 'a'.

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

Add '6' to each side of the equation.
-6 + 6 + -3a = -21 + 6

Combine like terms: -6 + 6 = 0
0 + -3a = -21 + 6
-3a = -21 + 6

Combine like terms: -21 + 6 = -15
-3a = -15

Divide each side by '-3'.
a = 5

Simplifying
a = 5

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