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Simplifying 20r + (-19r) + -1(-8) = -2 Multiply -1 * -8 20r + (-19r) + 8 = -2 Reorder the terms: 8 + 20r + (-19r) = -2 Combine like terms: 20r + (-19r) = 1r 8 + 1r = -2 Solving 8 + 1r = -2 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + 1r = -2 + -8 Combine like terms: 8 + -8 = 0 0 + 1r = -2 + -8 1r = -2 + -8 Combine like terms: -2 + -8 = -10 1r = -10 Divide each side by '1'. r = -10 Simplifying r = -10
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