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Simplifying 2((-1z)(-4)) + 30 = 12 Remove parenthesis around (-1z) 2(-1z(-4)) + 30 = 12 Reorder the terms for easier multiplication: 2(-1 * -4z) + 30 = 12 Multiply -1 * -4 2(4z) + 30 = 12 Remove parenthesis around (4z) 2 * 4z + 30 = 12 Multiply 2 * 4 8z + 30 = 12 Reorder the terms: 30 + 8z = 12 Solving 30 + 8z = 12 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + -30 + 8z = 12 + -30 Combine like terms: 30 + -30 = 0 0 + 8z = 12 + -30 8z = 12 + -30 Combine like terms: 12 + -30 = -18 8z = -18 Divide each side by '8'. z = -2.25 Simplifying z = -2.25
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