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Simplifying 630 = 12z + -18 Reorder the terms: 630 = -18 + 12z Solving 630 = -18 + 12z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-12z' to each side of the equation. 630 + -12z = -18 + 12z + -12z Combine like terms: 12z + -12z = 0 630 + -12z = -18 + 0 630 + -12z = -18 Add '-630' to each side of the equation. 630 + -630 + -12z = -18 + -630 Combine like terms: 630 + -630 = 0 0 + -12z = -18 + -630 -12z = -18 + -630 Combine like terms: -18 + -630 = -648 -12z = -648 Divide each side by '-12'. z = 54 Simplifying z = 54
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