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Simplifying -10 + -2r = 10 + r + 10 Reorder the terms: -10 + -2r = 10 + 10 + r Combine like terms: 10 + 10 = 20 -10 + -2r = 20 + r Solving -10 + -2r = 20 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. -10 + -2r + -1r = 20 + r + -1r Combine like terms: -2r + -1r = -3r -10 + -3r = 20 + r + -1r Combine like terms: r + -1r = 0 -10 + -3r = 20 + 0 -10 + -3r = 20 Add '10' to each side of the equation. -10 + 10 + -3r = 20 + 10 Combine like terms: -10 + 10 = 0 0 + -3r = 20 + 10 -3r = 20 + 10 Combine like terms: 20 + 10 = 30 -3r = 30 Divide each side by '-3'. r = -10 Simplifying r = -10
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