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Simplifying -21 = r + 28 Reorder the terms: -21 = 28 + r Solving -21 = 28 + 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. -21 + -1r = 28 + r + -1r Combine like terms: r + -1r = 0 -21 + -1r = 28 + 0 -21 + -1r = 28 Add '21' to each side of the equation. -21 + 21 + -1r = 28 + 21 Combine like terms: -21 + 21 = 0 0 + -1r = 28 + 21 -1r = 28 + 21 Combine like terms: 28 + 21 = 49 -1r = 49 Divide each side by '-1'. r = -49 Simplifying r = -49
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