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Simplifying
(-7z)(-4z) = 0
Remove parenthesis around (-7z)
-7z(-4z) = 0
Remove parenthesis around (-4z)
-7z * -4z = 0
Reorder the terms for easier multiplication:
-7 * -4z * z = 0
Multiply -7 * -4
28z * z = 0
Multiply z * z
28z2 = 0
Solving
28z2 = 0
Solving for variable 'z'.
Move all terms containing z to the left, all other terms to the right.
Divide each side by '28'.
z2 = 0
Simplifying
z2 = 0
Take the square root of each side:
z = {0}
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