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Simplifying -4 = r + 20 + -5 Reorder the terms: -4 = 20 + -5 + r Combine like terms: 20 + -5 = 15 -4 = 15 + r Solving -4 = 15 + 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 = 15 + r + -1r Combine like terms: r + -1r = 0 -4 + -1r = 15 + 0 -4 + -1r = 15 Add '4' to each side of the equation. -4 + 4 + -1r = 15 + 4 Combine like terms: -4 + 4 = 0 0 + -1r = 15 + 4 -1r = 15 + 4 Combine like terms: 15 + 4 = 19 -1r = 19 Divide each side by '-1'. r = -19 Simplifying r = -19
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