21-(5-3a)=10

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Solution for 21-(5-3a)=10 equation: 


Simplifying
21 + -1(5 + -3a) = 10
21 + (5 * -1 + -3a * -1) = 10
21 + (-5 + 3a) = 10

Combine like terms: 21 + -5 = 16
16 + 3a = 10

Solving
16 + 3a = 10

Solving for variable 'a'.

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

Add '-16' to each side of the equation.
16 + -16 + 3a = 10 + -16

Combine like terms: 16 + -16 = 0
0 + 3a = 10 + -16
3a = 10 + -16

Combine like terms: 10 + -16 = -6
3a = -6

Divide each side by '3'.
a = -2

Simplifying
a = -2

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