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Simplifying -16 + -4 = 4r Combine like terms: -16 + -4 = -20 -20 = 4r Solving -20 = 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. -20 + -4r = 4r + -4r Combine like terms: 4r + -4r = 0 -20 + -4r = 0 Add '20' to each side of the equation. -20 + 20 + -4r = 0 + 20 Combine like terms: -20 + 20 = 0 0 + -4r = 0 + 20 -4r = 0 + 20 Combine like terms: 0 + 20 = 20 -4r = 20 Divide each side by '-4'. r = -5 Simplifying r = -5
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