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Simplifying -63 = 28 + 7r Solving -63 = 28 + 7r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7r' to each side of the equation. -63 + -7r = 28 + 7r + -7r Combine like terms: 7r + -7r = 0 -63 + -7r = 28 + 0 -63 + -7r = 28 Add '63' to each side of the equation. -63 + 63 + -7r = 28 + 63 Combine like terms: -63 + 63 = 0 0 + -7r = 28 + 63 -7r = 28 + 63 Combine like terms: 28 + 63 = 91 -7r = 91 Divide each side by '-7'. r = -13 Simplifying r = -13
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