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Simplifying 39 = 7(2r + -7) + r Reorder the terms: 39 = 7(-7 + 2r) + r 39 = (-7 * 7 + 2r * 7) + r 39 = (-49 + 14r) + r Combine like terms: 14r + r = 15r 39 = -49 + 15r Solving 39 = -49 + 15r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-15r' to each side of the equation. 39 + -15r = -49 + 15r + -15r Combine like terms: 15r + -15r = 0 39 + -15r = -49 + 0 39 + -15r = -49 Add '-39' to each side of the equation. 39 + -39 + -15r = -49 + -39 Combine like terms: 39 + -39 = 0 0 + -15r = -49 + -39 -15r = -49 + -39 Combine like terms: -49 + -39 = -88 -15r = -88 Divide each side by '-15'. r = 5.866666667 Simplifying r = 5.866666667
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