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Simplifying 10 + 5r = 2(2 + r) 10 + 5r = (2 * 2 + r * 2) 10 + 5r = (4 + 2r) Solving 10 + 5r = 4 + 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 + 5r + -2r = 4 + 2r + -2r Combine like terms: 5r + -2r = 3r 10 + 3r = 4 + 2r + -2r Combine like terms: 2r + -2r = 0 10 + 3r = 4 + 0 10 + 3r = 4 Add '-10' to each side of the equation. 10 + -10 + 3r = 4 + -10 Combine like terms: 10 + -10 = 0 0 + 3r = 4 + -10 3r = 4 + -10 Combine like terms: 4 + -10 = -6 3r = -6 Divide each side by '3'. r = -2 Simplifying r = -2
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