-3(a+7)=

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Solution for -3(a+7)= equation: 


Simplifying
-3(a + 7) = 0

Reorder the terms:
-3(7 + a) = 0
(7 * -3 + a * -3) = 0
(-21 + -3a) = 0

Solving
-21 + -3a = 0

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 + -3a = 0 + 21

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

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

Divide each side by '-3'.
a = -7

Simplifying
a = -7

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