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Simplifying -1r + 8(7r + 1) = 228 Reorder the terms: -1r + 8(1 + 7r) = 228 -1r + (1 * 8 + 7r * 8) = 228 -1r + (8 + 56r) = 228 Reorder the terms: 8 + -1r + 56r = 228 Combine like terms: -1r + 56r = 55r 8 + 55r = 228 Solving 8 + 55r = 228 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + 55r = 228 + -8 Combine like terms: 8 + -8 = 0 0 + 55r = 228 + -8 55r = 228 + -8 Combine like terms: 228 + -8 = 220 55r = 220 Divide each side by '55'. r = 4 Simplifying r = 4
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