-5(1+4a)=15

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Solution for -5(1+4a)=15 equation: 


Simplifying
-5(1 + 4a) = 15
(1 * -5 + 4a * -5) = 15
(-5 + -20a) = 15

Solving
-5 + -20a = 15

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 + -20a = 15 + 5

Combine like terms: -5 + 5 = 0
0 + -20a = 15 + 5
-20a = 15 + 5

Combine like terms: 15 + 5 = 20
-20a = 20

Divide each side by '-20'.
a = -1

Simplifying
a = -1

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