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Simplifying -1r + -7 = -9 Reorder the terms: -7 + -1r = -9 Solving -7 + -1r = -9 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + -1r = -9 + 7 Combine like terms: -7 + 7 = 0 0 + -1r = -9 + 7 -1r = -9 + 7 Combine like terms: -9 + 7 = -2 -1r = -2 Divide each side by '-1'. r = 2 Simplifying r = 2
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