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Simplifying 19 = 1 + -7r + -2r Combine like terms: -7r + -2r = -9r 19 = 1 + -9r Solving 19 = 1 + -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. 19 + 9r = 1 + -9r + 9r Combine like terms: -9r + 9r = 0 19 + 9r = 1 + 0 19 + 9r = 1 Add '-19' to each side of the equation. 19 + -19 + 9r = 1 + -19 Combine like terms: 19 + -19 = 0 0 + 9r = 1 + -19 9r = 1 + -19 Combine like terms: 1 + -19 = -18 9r = -18 Divide each side by '9'. r = -2 Simplifying r = -2
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