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Simplifying 7r + -3 = -21 + 9r Reorder the terms: -3 + 7r = -21 + 9r Solving -3 + 7r = -21 + 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. -3 + 7r + -9r = -21 + 9r + -9r Combine like terms: 7r + -9r = -2r -3 + -2r = -21 + 9r + -9r Combine like terms: 9r + -9r = 0 -3 + -2r = -21 + 0 -3 + -2r = -21 Add '3' to each side of the equation. -3 + 3 + -2r = -21 + 3 Combine like terms: -3 + 3 = 0 0 + -2r = -21 + 3 -2r = -21 + 3 Combine like terms: -21 + 3 = -18 -2r = -18 Divide each side by '-2'. r = 9 Simplifying r = 9
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