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Simplifying -1r + -1r + -5r + -7r + -10 = 20 Reorder the terms: -10 + -1r + -1r + -5r + -7r = 20 Combine like terms: -1r + -1r = -2r -10 + -2r + -5r + -7r = 20 Combine like terms: -2r + -5r = -7r -10 + -7r + -7r = 20 Combine like terms: -7r + -7r = -14r -10 + -14r = 20 Solving -10 + -14r = 20 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + -14r = 20 + 10 Combine like terms: -10 + 10 = 0 0 + -14r = 20 + 10 -14r = 20 + 10 Combine like terms: 20 + 10 = 30 -14r = 30 Divide each side by '-14'. r = -2.142857143 Simplifying r = -2.142857143
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