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Simplifying 2r + -9 = 7 + 10r Reorder the terms: -9 + 2r = 7 + 10r Solving -9 + 2r = 7 + 10r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-10r' to each side of the equation. -9 + 2r + -10r = 7 + 10r + -10r Combine like terms: 2r + -10r = -8r -9 + -8r = 7 + 10r + -10r Combine like terms: 10r + -10r = 0 -9 + -8r = 7 + 0 -9 + -8r = 7 Add '9' to each side of the equation. -9 + 9 + -8r = 7 + 9 Combine like terms: -9 + 9 = 0 0 + -8r = 7 + 9 -8r = 7 + 9 Combine like terms: 7 + 9 = 16 -8r = 16 Divide each side by '-8'. r = -2 Simplifying r = -2
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