(4a)(-a)=0

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Solution for (4a)(-a)=0 equation: 


Simplifying
(4a)(-1a) = 0

Remove parenthesis around (4a)
4a(-1a) = 0

Remove parenthesis around (-1a)
4a * -1a = 0

Reorder the terms for easier multiplication:
4 * -1a * a = 0

Multiply 4 * -1
-4a * a = 0

Multiply a * a
-4a2 = 0

Solving
-4a2 = 0

Solving for variable 'a'.

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

Divide each side by '-4'.
a2 = 0

Simplifying
a2 = 0

Take the square root of each side:
a = {0}

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