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Simplifying -9 = 3 + r Solving -9 = 3 + r 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. -9 + -1r = 3 + r + -1r Combine like terms: r + -1r = 0 -9 + -1r = 3 + 0 -9 + -1r = 3 Add '9' to each side of the equation. -9 + 9 + -1r = 3 + 9 Combine like terms: -9 + 9 = 0 0 + -1r = 3 + 9 -1r = 3 + 9 Combine like terms: 3 + 9 = 12 -1r = 12 Divide each side by '-1'. r = -12 Simplifying r = -12
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