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Simplifying -4 = r + 9 Reorder the terms: -4 = 9 + r Solving -4 = 9 + 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. -4 + -1r = 9 + r + -1r Combine like terms: r + -1r = 0 -4 + -1r = 9 + 0 -4 + -1r = 9 Add '4' to each side of the equation. -4 + 4 + -1r = 9 + 4 Combine like terms: -4 + 4 = 0 0 + -1r = 9 + 4 -1r = 9 + 4 Combine like terms: 9 + 4 = 13 -1r = 13 Divide each side by '-1'. r = -13 Simplifying r = -13
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