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Simplifying 10 = 10 + 2r + -40 Reorder the terms: 10 = 10 + -40 + 2r Combine like terms: 10 + -40 = -30 10 = -30 + 2r Solving 10 = -30 + 2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2r' to each side of the equation. 10 + -2r = -30 + 2r + -2r Combine like terms: 2r + -2r = 0 10 + -2r = -30 + 0 10 + -2r = -30 Add '-10' to each side of the equation. 10 + -10 + -2r = -30 + -10 Combine like terms: 10 + -10 = 0 0 + -2r = -30 + -10 -2r = -30 + -10 Combine like terms: -30 + -10 = -40 -2r = -40 Divide each side by '-2'. r = 20 Simplifying r = 20
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