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Simplifying 4r + -13 = r + 8 Reorder the terms: -13 + 4r = r + 8 Reorder the terms: -13 + 4r = 8 + r Solving -13 + 4r = 8 + 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. -13 + 4r + -1r = 8 + r + -1r Combine like terms: 4r + -1r = 3r -13 + 3r = 8 + r + -1r Combine like terms: r + -1r = 0 -13 + 3r = 8 + 0 -13 + 3r = 8 Add '13' to each side of the equation. -13 + 13 + 3r = 8 + 13 Combine like terms: -13 + 13 = 0 0 + 3r = 8 + 13 3r = 8 + 13 Combine like terms: 8 + 13 = 21 3r = 21 Divide each side by '3'. r = 7 Simplifying r = 7
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