15-9(9+4a)=42

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Solution for 15-9(9+4a)=42 equation:


Simplifying
15 + -9(9 + 4a) = 42
15 + (9 * -9 + 4a * -9) = 42
15 + (-81 + -36a) = 42

Combine like terms: 15 + -81 = -66
-66 + -36a = 42

Solving
-66 + -36a = 42

Solving for variable 'a'.

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

Add '66' to each side of the equation.
-66 + 66 + -36a = 42 + 66

Combine like terms: -66 + 66 = 0
0 + -36a = 42 + 66
-36a = 42 + 66

Combine like terms: 42 + 66 = 108
-36a = 108

Divide each side by '-36'.
a = -3

Simplifying
a = -3

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