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Simplifying -28 = 7(3x + 4) + 21r Reorder the terms: -28 = 7(4 + 3x) + 21r -28 = (4 * 7 + 3x * 7) + 21r -28 = (28 + 21x) + 21r Reorder the terms: -28 = 28 + 21r + 21x Solving -28 = 28 + 21r + 21x Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-21r' to each side of the equation. -28 + -21r = 28 + 21r + -21r + 21x Combine like terms: 21r + -21r = 0 -28 + -21r = 28 + 0 + 21x -28 + -21r = 28 + 21x Add '28' to each side of the equation. -28 + 28 + -21r = 28 + 28 + 21x Combine like terms: -28 + 28 = 0 0 + -21r = 28 + 28 + 21x -21r = 28 + 28 + 21x Combine like terms: 28 + 28 = 56 -21r = 56 + 21x Divide each side by '-21'. r = -2.666666667 + -1x Simplifying r = -2.666666667 + -1x
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