5(1+3a)=-100

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Solution for 5(1+3a)=-100 equation: 


Simplifying
5(1 + 3a) = -100
(1 * 5 + 3a * 5) = -100
(5 + 15a) = -100

Solving
5 + 15a = -100

Solving for variable 'a'.

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

Add '-5' to each side of the equation.
5 + -5 + 15a = -100 + -5

Combine like terms: 5 + -5 = 0
0 + 15a = -100 + -5
15a = -100 + -5

Combine like terms: -100 + -5 = -105
15a = -105

Divide each side by '15'.
a = -7

Simplifying
a = -7

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