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Simplifying 18 = 7 + -1(3z + 2z) Combine like terms: 3z + 2z = 5z 18 = 7 + -1(5z) Remove parenthesis around (5z) 18 = 7 + -1 * 5z Multiply -1 * 5 18 = 7 + -5z Solving 18 = 7 + -5z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '5z' to each side of the equation. 18 + 5z = 7 + -5z + 5z Combine like terms: -5z + 5z = 0 18 + 5z = 7 + 0 18 + 5z = 7 Add '-18' to each side of the equation. 18 + -18 + 5z = 7 + -18 Combine like terms: 18 + -18 = 0 0 + 5z = 7 + -18 5z = 7 + -18 Combine like terms: 7 + -18 = -11 5z = -11 Divide each side by '5'. z = -2.2 Simplifying z = -2.2
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