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Simplifying 91 = r + 63 Reorder the terms: 91 = 63 + r Solving 91 = 63 + 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. 91 + -1r = 63 + r + -1r Combine like terms: r + -1r = 0 91 + -1r = 63 + 0 91 + -1r = 63 Add '-91' to each side of the equation. 91 + -91 + -1r = 63 + -91 Combine like terms: 91 + -91 = 0 0 + -1r = 63 + -91 -1r = 63 + -91 Combine like terms: 63 + -91 = -28 -1r = -28 Divide each side by '-1'. r = 28 Simplifying r = 28
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