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Simplifying 15r + -10 = 13r + 4 Reorder the terms: -10 + 15r = 13r + 4 Reorder the terms: -10 + 15r = 4 + 13r Solving -10 + 15r = 4 + 13r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-13r' to each side of the equation. -10 + 15r + -13r = 4 + 13r + -13r Combine like terms: 15r + -13r = 2r -10 + 2r = 4 + 13r + -13r Combine like terms: 13r + -13r = 0 -10 + 2r = 4 + 0 -10 + 2r = 4 Add '10' to each side of the equation. -10 + 10 + 2r = 4 + 10 Combine like terms: -10 + 10 = 0 0 + 2r = 4 + 10 2r = 4 + 10 Combine like terms: 4 + 10 = 14 2r = 14 Divide each side by '2'. r = 7 Simplifying r = 7
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