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Simplifying 10r + -7 = 9r Reorder the terms: -7 + 10r = 9r Solving -7 + 10r = 9r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9r' to each side of the equation. -7 + 10r + -9r = 9r + -9r Combine like terms: 10r + -9r = 1r -7 + 1r = 9r + -9r Combine like terms: 9r + -9r = 0 -7 + 1r = 0 Add '7' to each side of the equation. -7 + 7 + 1r = 0 + 7 Combine like terms: -7 + 7 = 0 0 + 1r = 0 + 7 1r = 0 + 7 Combine like terms: 0 + 7 = 7 1r = 7 Divide each side by '1'. r = 7 Simplifying r = 7
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