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Simplifying -9 = -1(r + -7) Reorder the terms: -9 = -1(-7 + r) -9 = (-7 * -1 + r * -1) -9 = (7 + -1r) Solving -9 = 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. -9 + r = 7 + -1r + r Combine like terms: -1r + r = 0 -9 + r = 7 + 0 -9 + r = 7 Add '9' to each side of the equation. -9 + 9 + r = 7 + 9 Combine like terms: -9 + 9 = 0 0 + r = 7 + 9 r = 7 + 9 Combine like terms: 7 + 9 = 16 r = 16 Simplifying r = 16
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