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Simplifying 13r + -77 = 15r + -87 Reorder the terms: -77 + 13r = 15r + -87 Reorder the terms: -77 + 13r = -87 + 15r Solving -77 + 13r = -87 + 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. -77 + 13r + -15r = -87 + 15r + -15r Combine like terms: 13r + -15r = -2r -77 + -2r = -87 + 15r + -15r Combine like terms: 15r + -15r = 0 -77 + -2r = -87 + 0 -77 + -2r = -87 Add '77' to each side of the equation. -77 + 77 + -2r = -87 + 77 Combine like terms: -77 + 77 = 0 0 + -2r = -87 + 77 -2r = -87 + 77 Combine like terms: -87 + 77 = -10 -2r = -10 Divide each side by '-2'. r = 5 Simplifying r = 5
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