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Simplifying 3 = r + 18 Reorder the terms: 3 = 18 + r Solving 3 = 18 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. 3 + -1r = 18 + r + -1r Combine like terms: r + -1r = 0 3 + -1r = 18 + 0 3 + -1r = 18 Add '-3' to each side of the equation. 3 + -3 + -1r = 18 + -3 Combine like terms: 3 + -3 = 0 0 + -1r = 18 + -3 -1r = 18 + -3 Combine like terms: 18 + -3 = 15 -1r = 15 Divide each side by '-1'. r = -15 Simplifying r = -15
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