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