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Simplifying -7 = 1 + -6r + 7r Combine like terms: -6r + 7r = 1r -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 '-1r' to each side of the equation. -7 + -1r = 1 + 1r + -1r Combine like terms: 1r + -1r = 0 -7 + -1r = 1 + 0 -7 + -1r = 1 Add '7' to each side of the equation. -7 + 7 + -1r = 1 + 7 Combine like terms: -7 + 7 = 0 0 + -1r = 1 + 7 -1r = 1 + 7 Combine like terms: 1 + 7 = 8 -1r = 8 Divide each side by '-1'. r = -8 Simplifying r = -8
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