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Simplifying -1(r + 12) = -7 Reorder the terms: -1(12 + r) = -7 (12 * -1 + r * -1) = -7 (-12 + -1r) = -7 Solving -12 + -1r = -7 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + -1r = -7 + 12 Combine like terms: -12 + 12 = 0 0 + -1r = -7 + 12 -1r = -7 + 12 Combine like terms: -7 + 12 = 5 -1r = 5 Divide each side by '-1'. r = -5 Simplifying r = -5
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