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Simplifying 10r + -14 + 21 + -4r = -23 Reorder the terms: -14 + 21 + 10r + -4r = -23 Combine like terms: -14 + 21 = 7 7 + 10r + -4r = -23 Combine like terms: 10r + -4r = 6r 7 + 6r = -23 Solving 7 + 6r = -23 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 6r = -23 + -7 Combine like terms: 7 + -7 = 0 0 + 6r = -23 + -7 6r = -23 + -7 Combine like terms: -23 + -7 = -30 6r = -30 Divide each side by '6'. r = -5 Simplifying r = -5
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