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Simplifying 7r + -21 = 30 + 8r Reorder the terms: -21 + 7r = 30 + 8r Solving -21 + 7r = 30 + 8r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8r' to each side of the equation. -21 + 7r + -8r = 30 + 8r + -8r Combine like terms: 7r + -8r = -1r -21 + -1r = 30 + 8r + -8r Combine like terms: 8r + -8r = 0 -21 + -1r = 30 + 0 -21 + -1r = 30 Add '21' to each side of the equation. -21 + 21 + -1r = 30 + 21 Combine like terms: -21 + 21 = 0 0 + -1r = 30 + 21 -1r = 30 + 21 Combine like terms: 30 + 21 = 51 -1r = 51 Divide each side by '-1'. r = -51 Simplifying r = -51
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