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Simplifying 63 = r + 45 Reorder the terms: 63 = 45 + r Solving 63 = 45 + 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. 63 + -1r = 45 + r + -1r Combine like terms: r + -1r = 0 63 + -1r = 45 + 0 63 + -1r = 45 Add '-63' to each side of the equation. 63 + -63 + -1r = 45 + -63 Combine like terms: 63 + -63 = 0 0 + -1r = 45 + -63 -1r = 45 + -63 Combine like terms: 45 + -63 = -18 -1r = -18 Divide each side by '-1'. r = 18 Simplifying r = 18
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