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Simplifying 3r + -13 = r + -3 Reorder the terms: -13 + 3r = r + -3 Reorder the terms: -13 + 3r = -3 + r Solving -13 + 3r = -3 + 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. -13 + 3r + -1r = -3 + r + -1r Combine like terms: 3r + -1r = 2r -13 + 2r = -3 + r + -1r Combine like terms: r + -1r = 0 -13 + 2r = -3 + 0 -13 + 2r = -3 Add '13' to each side of the equation. -13 + 13 + 2r = -3 + 13 Combine like terms: -13 + 13 = 0 0 + 2r = -3 + 13 2r = -3 + 13 Combine like terms: -3 + 13 = 10 2r = 10 Divide each side by '2'. r = 5 Simplifying r = 5
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