-4-6.5(1-2.5a)=28.5

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Solution for -4-6.5(1-2.5a)=28.5 equation: 


Simplifying
-4 + -6.5(1 + -2.5a) = 28.5
-4 + (1 * -6.5 + -2.5a * -6.5) = 28.5
-4 + (-6.5 + 16.25a) = 28.5

Combine like terms: -4 + -6.5 = -10.5
-10.5 + 16.25a = 28.5

Solving
-10.5 + 16.25a = 28.5

Solving for variable 'a'.

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

Add '10.5' to each side of the equation.
-10.5 + 10.5 + 16.25a = 28.5 + 10.5

Combine like terms: -10.5 + 10.5 = 0.0
0.0 + 16.25a = 28.5 + 10.5
16.25a = 28.5 + 10.5

Combine like terms: 28.5 + 10.5 = 39
16.25a = 39

Divide each side by '16.25'.
a = 2.4

Simplifying
a = 2.4

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