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Simplifying 13 + 3r = 2(4 + r) + 3 13 + 3r = (4 * 2 + r * 2) + 3 13 + 3r = (8 + 2r) + 3 Reorder the terms: 13 + 3r = 8 + 3 + 2r Combine like terms: 8 + 3 = 11 13 + 3r = 11 + 2r Solving 13 + 3r = 11 + 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. 13 + 3r + -2r = 11 + 2r + -2r Combine like terms: 3r + -2r = 1r 13 + 1r = 11 + 2r + -2r Combine like terms: 2r + -2r = 0 13 + 1r = 11 + 0 13 + 1r = 11 Add '-13' to each side of the equation. 13 + -13 + 1r = 11 + -13 Combine like terms: 13 + -13 = 0 0 + 1r = 11 + -13 1r = 11 + -13 Combine like terms: 11 + -13 = -2 1r = -2 Divide each side by '1'. r = -2 Simplifying r = -2
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