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Simplifying 15 + -9 = r + 4 Combine like terms: 15 + -9 = 6 6 = r + 4 Reorder the terms: 6 = 4 + r Solving 6 = 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. 6 + -1r = 4 + r + -1r Combine like terms: r + -1r = 0 6 + -1r = 4 + 0 6 + -1r = 4 Add '-6' to each side of the equation. 6 + -6 + -1r = 4 + -6 Combine like terms: 6 + -6 = 0 0 + -1r = 4 + -6 -1r = 4 + -6 Combine like terms: 4 + -6 = -2 -1r = -2 Divide each side by '-1'. r = 2 Simplifying r = 2
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