-21=99-15-3a

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Solution for -21=99-15-3a equation:


Simplifying
-21 = 99 + -15 + -3a

Combine like terms: 99 + -15 = 84
-21 = 84 + -3a

Solving
-21 = 84 + -3a

Solving for variable 'a'.

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

Add '3a' to each side of the equation.
-21 + 3a = 84 + -3a + 3a

Combine like terms: -3a + 3a = 0
-21 + 3a = 84 + 0
-21 + 3a = 84

Add '21' to each side of the equation.
-21 + 21 + 3a = 84 + 21

Combine like terms: -21 + 21 = 0
0 + 3a = 84 + 21
3a = 84 + 21

Combine like terms: 84 + 21 = 105
3a = 105

Divide each side by '3'.
a = 35

Simplifying
a = 35

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