-90=-3(8+3a)-3

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Solution for -90=-3(8+3a)-3 equation:


Simplifying
-90 = -3(8 + 3a) + -3
-90 = (8 * -3 + 3a * -3) + -3
-90 = (-24 + -9a) + -3

Reorder the terms:
-90 = -24 + -3 + -9a

Combine like terms: -24 + -3 = -27
-90 = -27 + -9a

Solving
-90 = -27 + -9a

Solving for variable 'a'.

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

Add '9a' to each side of the equation.
-90 + 9a = -27 + -9a + 9a

Combine like terms: -9a + 9a = 0
-90 + 9a = -27 + 0
-90 + 9a = -27

Add '90' to each side of the equation.
-90 + 90 + 9a = -27 + 90

Combine like terms: -90 + 90 = 0
0 + 9a = -27 + 90
9a = -27 + 90

Combine like terms: -27 + 90 = 63
9a = 63

Divide each side by '9'.
a = 7

Simplifying
a = 7

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