3(15-2a)=21

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Solution for 3(15-2a)=21 equation: 


Simplifying
3(15 + -2a) = 21
(15 * 3 + -2a * 3) = 21
(45 + -6a) = 21

Solving
45 + -6a = 21

Solving for variable 'a'.

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

Add '-45' to each side of the equation.
45 + -45 + -6a = 21 + -45

Combine like terms: 45 + -45 = 0
0 + -6a = 21 + -45
-6a = 21 + -45

Combine like terms: 21 + -45 = -24
-6a = -24

Divide each side by '-6'.
a = 4

Simplifying
a = 4

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