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Simplifying -1 + 7r + -4r = 4(7 + -1r) * 12 Combine like terms: 7r + -4r = 3r -1 + 3r = 4(7 + -1r) * 12 Reorder the terms for easier multiplication: -1 + 3r = 4 * 12(7 + -1r) Multiply 4 * 12 -1 + 3r = 48(7 + -1r) -1 + 3r = (7 * 48 + -1r * 48) -1 + 3r = (336 + -48r) Solving -1 + 3r = 336 + -48r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '48r' to each side of the equation. -1 + 3r + 48r = 336 + -48r + 48r Combine like terms: 3r + 48r = 51r -1 + 51r = 336 + -48r + 48r Combine like terms: -48r + 48r = 0 -1 + 51r = 336 + 0 -1 + 51r = 336 Add '1' to each side of the equation. -1 + 1 + 51r = 336 + 1 Combine like terms: -1 + 1 = 0 0 + 51r = 336 + 1 51r = 336 + 1 Combine like terms: 336 + 1 = 337 51r = 337 Divide each side by '51'. r = 6.607843137 Simplifying r = 6.607843137
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