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Simplifying -4 + -11 = 4r + 21 Combine like terms: -4 + -11 = -15 -15 = 4r + 21 Reorder the terms: -15 = 21 + 4r Solving -15 = 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. -15 + -4r = 21 + 4r + -4r Combine like terms: 4r + -4r = 0 -15 + -4r = 21 + 0 -15 + -4r = 21 Add '15' to each side of the equation. -15 + 15 + -4r = 21 + 15 Combine like terms: -15 + 15 = 0 0 + -4r = 21 + 15 -4r = 21 + 15 Combine like terms: 21 + 15 = 36 -4r = 36 Divide each side by '-4'. r = -9 Simplifying r = -9
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