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Simplifying -1r = r + -18 Reorder the terms: -1r = -18 + r Solving -1r = -18 + r 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. -1r + -1r = -18 + r + -1r Combine like terms: -1r + -1r = -2r -2r = -18 + r + -1r Combine like terms: r + -1r = 0 -2r = -18 + 0 -2r = -18 Divide each side by '-2'. r = 9 Simplifying r = 9
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