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Simplifying 8 + -20r = -2r + -19r + -7 Reorder the terms: 8 + -20r = -7 + -2r + -19r Combine like terms: -2r + -19r = -21r 8 + -20r = -7 + -21r Solving 8 + -20r = -7 + -21r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '21r' to each side of the equation. 8 + -20r + 21r = -7 + -21r + 21r Combine like terms: -20r + 21r = 1r 8 + 1r = -7 + -21r + 21r Combine like terms: -21r + 21r = 0 8 + 1r = -7 + 0 8 + 1r = -7 Add '-8' to each side of the equation. 8 + -8 + 1r = -7 + -8 Combine like terms: 8 + -8 = 0 0 + 1r = -7 + -8 1r = -7 + -8 Combine like terms: -7 + -8 = -15 1r = -15 Divide each side by '1'. r = -15 Simplifying r = -15
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