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Simplifying (7 + -1z)(5z + -1) = 0 Reorder the terms: (7 + -1z)(-1 + 5z) = 0 Multiply (7 + -1z) * (-1 + 5z) (7(-1 + 5z) + -1z * (-1 + 5z)) = 0 ((-1 * 7 + 5z * 7) + -1z * (-1 + 5z)) = 0 ((-7 + 35z) + -1z * (-1 + 5z)) = 0 (-7 + 35z + (-1 * -1z + 5z * -1z)) = 0 (-7 + 35z + (1z + -5z2)) = 0 Combine like terms: 35z + 1z = 36z (-7 + 36z + -5z2) = 0 Solving -7 + 36z + -5z2 = 0 Solving for variable 'z'. Factor a trinomial. (-7 + z)(1 + -5z) = 0Subproblem 1
Set the factor '(-7 + z)' equal to zero and attempt to solve: Simplifying -7 + z = 0 Solving -7 + z = 0 Move all terms containing z to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + z = 0 + 7 Combine like terms: -7 + 7 = 0 0 + z = 0 + 7 z = 0 + 7 Combine like terms: 0 + 7 = 7 z = 7 Simplifying z = 7Subproblem 2
Set the factor '(1 + -5z)' equal to zero and attempt to solve: Simplifying 1 + -5z = 0 Solving 1 + -5z = 0 Move all terms containing z to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -5z = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -5z = 0 + -1 -5z = 0 + -1 Combine like terms: 0 + -1 = -1 -5z = -1 Divide each side by '-5'. z = 0.2 Simplifying z = 0.2Solution
z = {7, 0.2}
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