5(8+3a)=-21

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Solution for 5(8+3a)=-21 equation: 


Simplifying
5(8 + 3a) = -21
(8 * 5 + 3a * 5) = -21
(40 + 15a) = -21

Solving
40 + 15a = -21

Solving for variable 'a'.

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

Add '-40' to each side of the equation.
40 + -40 + 15a = -21 + -40

Combine like terms: 40 + -40 = 0
0 + 15a = -21 + -40
15a = -21 + -40

Combine like terms: -21 + -40 = -61
15a = -61

Divide each side by '15'.
a = -4.066666667

Simplifying
a = -4.066666667

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