5(a+1)=20

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Solution for 5(a+1)=20 equation: 


Simplifying
5(a + 1) = 20

Reorder the terms:
5(1 + a) = 20
(1 * 5 + a * 5) = 20
(5 + 5a) = 20

Solving
5 + 5a = 20

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 + 5a = 20 + -5

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

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

Divide each side by '5'.
a = 3

Simplifying
a = 3

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