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Simplifying -21 = 10r + -1 Reorder the terms: -21 = -1 + 10r Solving -21 = -1 + 10r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-10r' to each side of the equation. -21 + -10r = -1 + 10r + -10r Combine like terms: 10r + -10r = 0 -21 + -10r = -1 + 0 -21 + -10r = -1 Add '21' to each side of the equation. -21 + 21 + -10r = -1 + 21 Combine like terms: -21 + 21 = 0 0 + -10r = -1 + 21 -10r = -1 + 21 Combine like terms: -1 + 21 = 20 -10r = 20 Divide each side by '-10'. r = -2 Simplifying r = -2
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