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Simplifying 3 + -2 + r = -7 + -1r Combine like terms: 3 + -2 = 1 1 + r = -7 + -1r Solving 1 + r = -7 + -1r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add 'r' to each side of the equation. 1 + r + r = -7 + -1r + r Combine like terms: r + r = 2r 1 + 2r = -7 + -1r + r Combine like terms: -1r + r = 0 1 + 2r = -7 + 0 1 + 2r = -7 Add '-1' to each side of the equation. 1 + -1 + 2r = -7 + -1 Combine like terms: 1 + -1 = 0 0 + 2r = -7 + -1 2r = -7 + -1 Combine like terms: -7 + -1 = -8 2r = -8 Divide each side by '2'. r = -4 Simplifying r = -4
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