-3(a-1)=21

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Solution for -3(a-1)=21 equation: 


Simplifying
-3(a + -1) = 21

Reorder the terms:
-3(-1 + a) = 21
(-1 * -3 + a * -3) = 21
(3 + -3a) = 21

Solving
3 + -3a = 21

Solving for variable 'a'.

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

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

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

Combine like terms: 21 + -3 = 18
-3a = 18

Divide each side by '-3'.
a = -6

Simplifying
a = -6

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