-5[6a+21]=-15

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Solution for -5[6a+21]=-15 equation:


Simplifying
-5[6a + 21] = -15

Reorder the terms:
-5[21 + 6a] = -15
[21 * -5 + 6a * -5] = -15
[-105 + -30a] = -15

Solving
-105 + -30a = -15

Solving for variable 'a'.

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

Add '105' to each side of the equation.
-105 + 105 + -30a = -15 + 105

Combine like terms: -105 + 105 = 0
0 + -30a = -15 + 105
-30a = -15 + 105

Combine like terms: -15 + 105 = 90
-30a = 90

Divide each side by '-30'.
a = -3

Simplifying
a = -3

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