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