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Simplifying 6r + -21 = -48 + 9r Reorder the terms: -21 + 6r = -48 + 9r Solving -21 + 6r = -48 + 9r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9r' to each side of the equation. -21 + 6r + -9r = -48 + 9r + -9r Combine like terms: 6r + -9r = -3r -21 + -3r = -48 + 9r + -9r Combine like terms: 9r + -9r = 0 -21 + -3r = -48 + 0 -21 + -3r = -48 Add '21' to each side of the equation. -21 + 21 + -3r = -48 + 21 Combine like terms: -21 + 21 = 0 0 + -3r = -48 + 21 -3r = -48 + 21 Combine like terms: -48 + 21 = -27 -3r = -27 Divide each side by '-3'. r = 9 Simplifying r = 9
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