3(7-a)=12

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Solution for 3(7-a)=12 equation: 


Simplifying
3(7 + -1a) = 12
(7 * 3 + -1a * 3) = 12
(21 + -3a) = 12

Solving
21 + -3a = 12

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 = 12 + -21

Combine like terms: 21 + -21 = 0
0 + -3a = 12 + -21
-3a = 12 + -21

Combine like terms: 12 + -21 = -9
-3a = -9

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

Simplifying
a = 3

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