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Simplifying 3r + -7 = -1 + r Reorder the terms: -7 + 3r = -1 + r Solving -7 + 3r = -1 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. -7 + 3r + -1r = -1 + r + -1r Combine like terms: 3r + -1r = 2r -7 + 2r = -1 + r + -1r Combine like terms: r + -1r = 0 -7 + 2r = -1 + 0 -7 + 2r = -1 Add '7' to each side of the equation. -7 + 7 + 2r = -1 + 7 Combine like terms: -7 + 7 = 0 0 + 2r = -1 + 7 2r = -1 + 7 Combine like terms: -1 + 7 = 6 2r = 6 Divide each side by '2'. r = 3 Simplifying r = 3
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