5(2a-1)=20

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Solution for 5(2a-1)=20 equation: 


Simplifying
5(2a + -1) = 20

Reorder the terms:
5(-1 + 2a) = 20
(-1 * 5 + 2a * 5) = 20
(-5 + 10a) = 20

Solving
-5 + 10a = 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 + 10a = 20 + 5

Combine like terms: -5 + 5 = 0
0 + 10a = 20 + 5
10a = 20 + 5

Combine like terms: 20 + 5 = 25
10a = 25

Divide each side by '10'.
a = 2.5

Simplifying
a = 2.5

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