4(a-5)=64

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Solution for 4(a-5)=64 equation: 


Simplifying
4(a + -5) = 64

Reorder the terms:
4(-5 + a) = 64
(-5 * 4 + a * 4) = 64
(-20 + 4a) = 64

Solving
-20 + 4a = 64

Solving for variable 'a'.

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

Add '20' to each side of the equation.
-20 + 20 + 4a = 64 + 20

Combine like terms: -20 + 20 = 0
0 + 4a = 64 + 20
4a = 64 + 20

Combine like terms: 64 + 20 = 84
4a = 84

Divide each side by '4'.
a = 21

Simplifying
a = 21

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