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Simplifying -20 = r + -77 Reorder the terms: -20 = -77 + r Solving -20 = -77 + 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. -20 + -1r = -77 + r + -1r Combine like terms: r + -1r = 0 -20 + -1r = -77 + 0 -20 + -1r = -77 Add '20' to each side of the equation. -20 + 20 + -1r = -77 + 20 Combine like terms: -20 + 20 = 0 0 + -1r = -77 + 20 -1r = -77 + 20 Combine like terms: -77 + 20 = -57 -1r = -57 Divide each side by '-1'. r = 57 Simplifying r = 57
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