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Simplifying 8x + 2(10 + -1r) = 0 8x + (10 * 2 + -1r * 2) = 0 8x + (20 + -2r) = 0 Reorder the terms: 20 + -2r + 8x = 0 Solving 20 + -2r + 8x = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -2r + -20 + 8x = 0 + -20 Reorder the terms: 20 + -20 + -2r + 8x = 0 + -20 Combine like terms: 20 + -20 = 0 0 + -2r + 8x = 0 + -20 -2r + 8x = 0 + -20 Combine like terms: 0 + -20 = -20 -2r + 8x = -20 Add '-8x' to each side of the equation. -2r + 8x + -8x = -20 + -8x Combine like terms: 8x + -8x = 0 -2r + 0 = -20 + -8x -2r = -20 + -8x Divide each side by '-2'. r = 10 + 4x Simplifying r = 10 + 4x
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