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Simplifying 3r + -27 = -21 + 4r Reorder the terms: -27 + 3r = -21 + 4r Solving -27 + 3r = -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 + 3r + -4r = -21 + 4r + -4r Combine like terms: 3r + -4r = -1r -27 + -1r = -21 + 4r + -4r Combine like terms: 4r + -4r = 0 -27 + -1r = -21 + 0 -27 + -1r = -21 Add '27' to each side of the equation. -27 + 27 + -1r = -21 + 27 Combine like terms: -27 + 27 = 0 0 + -1r = -21 + 27 -1r = -21 + 27 Combine like terms: -21 + 27 = 6 -1r = 6 Divide each side by '-1'. r = -6 Simplifying r = -6
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