2.5-8(1-5a)=-20.5

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Solution for 2.5-8(1-5a)=-20.5 equation: 


Simplifying
2.5 + -8(1 + -5a) = -20.5
2.5 + (1 * -8 + -5a * -8) = -20.5
2.5 + (-8 + 40a) = -20.5

Combine like terms: 2.5 + -8 = -5.5
-5.5 + 40a = -20.5

Solving
-5.5 + 40a = -20.5

Solving for variable 'a'.

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

Add '5.5' to each side of the equation.
-5.5 + 5.5 + 40a = -20.5 + 5.5

Combine like terms: -5.5 + 5.5 = 0.0
0.0 + 40a = -20.5 + 5.5
40a = -20.5 + 5.5

Combine like terms: -20.5 + 5.5 = -15
40a = -15

Divide each side by '40'.
a = -0.375

Simplifying
a = -0.375

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