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Simplifying -27 = 7 * 3 + -4r Multiply 7 * 3 -27 = 21 + -4r Solving -27 = 21 + -4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4r' to each side of the equation. -27 + 4r = 21 + -4r + 4r Combine like terms: -4r + 4r = 0 -27 + 4r = 21 + 0 -27 + 4r = 21 Add '27' to each side of the equation. -27 + 27 + 4r = 21 + 27 Combine like terms: -27 + 27 = 0 0 + 4r = 21 + 27 4r = 21 + 27 Combine like terms: 21 + 27 = 48 4r = 48 Divide each side by '4'. r = 12 Simplifying r = 12
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