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Simplifying -7r + -21 = 63 Reorder the terms: -21 + -7r = 63 Solving -21 + -7r = 63 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + -7r = 63 + 21 Combine like terms: -21 + 21 = 0 0 + -7r = 63 + 21 -7r = 63 + 21 Combine like terms: 63 + 21 = 84 -7r = 84 Divide each side by '-7'. r = -12 Simplifying r = -12
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