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Simplifying 10r + -100 = 7r + -9 Reorder the terms: -100 + 10r = 7r + -9 Reorder the terms: -100 + 10r = -9 + 7r Solving -100 + 10r = -9 + 7r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7r' to each side of the equation. -100 + 10r + -7r = -9 + 7r + -7r Combine like terms: 10r + -7r = 3r -100 + 3r = -9 + 7r + -7r Combine like terms: 7r + -7r = 0 -100 + 3r = -9 + 0 -100 + 3r = -9 Add '100' to each side of the equation. -100 + 100 + 3r = -9 + 100 Combine like terms: -100 + 100 = 0 0 + 3r = -9 + 100 3r = -9 + 100 Combine like terms: -9 + 100 = 91 3r = 91 Divide each side by '3'. r = 30.33333333 Simplifying r = 30.33333333
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