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Simplifying
5z2 + 5 = 725
Reorder the terms:
5 + 5z2 = 725
Solving
5 + 5z2 = 725
Solving for variable 'z'.
Move all terms containing z to the left, all other terms to the right.
Add '-5' to each side of the equation.
5 + -5 + 5z2 = 725 + -5
Combine like terms: 5 + -5 = 0
0 + 5z2 = 725 + -5
5z2 = 725 + -5
Combine like terms: 725 + -5 = 720
5z2 = 720
Divide each side by '5'.
z2 = 144
Simplifying
z2 = 144
Take the square root of each side:
z = {-12, 12}
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