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Simplifying -7 = -1r + 1 Reorder the terms: -7 = 1 + -1r Solving -7 = 1 + -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. -7 + r = 1 + -1r + r Combine like terms: -1r + r = 0 -7 + r = 1 + 0 -7 + r = 1 Add '7' to each side of the equation. -7 + 7 + r = 1 + 7 Combine like terms: -7 + 7 = 0 0 + r = 1 + 7 r = 1 + 7 Combine like terms: 1 + 7 = 8 r = 8 Simplifying r = 8
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