-3a-3(3a-6)=90

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Solution for -3a-3(3a-6)=90 equation:


Simplifying
-3a + -3(3a + -6) = 90

Reorder the terms:
-3a + -3(-6 + 3a) = 90
-3a + (-6 * -3 + 3a * -3) = 90
-3a + (18 + -9a) = 90

Reorder the terms:
18 + -3a + -9a = 90

Combine like terms: -3a + -9a = -12a
18 + -12a = 90

Solving
18 + -12a = 90

Solving for variable 'a'.

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

Add '-18' to each side of the equation.
18 + -18 + -12a = 90 + -18

Combine like terms: 18 + -18 = 0
0 + -12a = 90 + -18
-12a = 90 + -18

Combine like terms: 90 + -18 = 72
-12a = 72

Divide each side by '-12'.
a = -6

Simplifying
a = -6

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