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Simplifying 6r + -15 = 20 + r Reorder the terms: -15 + 6r = 20 + r Solving -15 + 6r = 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. -15 + 6r + -1r = 20 + r + -1r Combine like terms: 6r + -1r = 5r -15 + 5r = 20 + r + -1r Combine like terms: r + -1r = 0 -15 + 5r = 20 + 0 -15 + 5r = 20 Add '15' to each side of the equation. -15 + 15 + 5r = 20 + 15 Combine like terms: -15 + 15 = 0 0 + 5r = 20 + 15 5r = 20 + 15 Combine like terms: 20 + 15 = 35 5r = 35 Divide each side by '5'. r = 7 Simplifying r = 7
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