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Simplifying 5z + 7(9z + -3) = 115 Reorder the terms: 5z + 7(-3 + 9z) = 115 5z + (-3 * 7 + 9z * 7) = 115 5z + (-21 + 63z) = 115 Reorder the terms: -21 + 5z + 63z = 115 Combine like terms: 5z + 63z = 68z -21 + 68z = 115 Solving -21 + 68z = 115 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 68z = 115 + 21 Combine like terms: -21 + 21 = 0 0 + 68z = 115 + 21 68z = 115 + 21 Combine like terms: 115 + 21 = 136 68z = 136 Divide each side by '68'. z = 2 Simplifying z = 2
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