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Simplifying 4r + -20 + 12r + 42 = 0 Reorder the terms: -20 + 42 + 4r + 12r = 0 Combine like terms: -20 + 42 = 22 22 + 4r + 12r = 0 Combine like terms: 4r + 12r = 16r 22 + 16r = 0 Solving 22 + 16r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-22' to each side of the equation. 22 + -22 + 16r = 0 + -22 Combine like terms: 22 + -22 = 0 0 + 16r = 0 + -22 16r = 0 + -22 Combine like terms: 0 + -22 = -22 16r = -22 Divide each side by '16'. r = -1.375 Simplifying r = -1.375
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