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Simplifying -2 + -1r + -7 = 12 Reorder the terms: -2 + -7 + -1r = 12 Combine like terms: -2 + -7 = -9 -9 + -1r = 12 Solving -9 + -1r = 12 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -1r = 12 + 9 Combine like terms: -9 + 9 = 0 0 + -1r = 12 + 9 -1r = 12 + 9 Combine like terms: 12 + 9 = 21 -1r = 21 Divide each side by '-1'. r = -21 Simplifying r = -21
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