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Simplifying 77 + -10r = 5r + 19 Reorder the terms: 77 + -10r = 19 + 5r Solving 77 + -10r = 19 + 5r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5r' to each side of the equation. 77 + -10r + -5r = 19 + 5r + -5r Combine like terms: -10r + -5r = -15r 77 + -15r = 19 + 5r + -5r Combine like terms: 5r + -5r = 0 77 + -15r = 19 + 0 77 + -15r = 19 Add '-77' to each side of the equation. 77 + -77 + -15r = 19 + -77 Combine like terms: 77 + -77 = 0 0 + -15r = 19 + -77 -15r = 19 + -77 Combine like terms: 19 + -77 = -58 -15r = -58 Divide each side by '-15'. r = 3.866666667 Simplifying r = 3.866666667
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