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