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Simplifying
3z2 + -5 = 142
Reorder the terms:
-5 + 3z2 = 142
Solving
-5 + 3z2 = 142
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 + 3z2 = 142 + 5
Combine like terms: -5 + 5 = 0
0 + 3z2 = 142 + 5
3z2 = 142 + 5
Combine like terms: 142 + 5 = 147
3z2 = 147
Divide each side by '3'.
z2 = 49
Simplifying
z2 = 49
Take the square root of each side:
z = {-7, 7}
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