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Simplifying -18 = r + -7 Reorder the terms: -18 = -7 + r Solving -18 = -7 + 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. -18 + -1r = -7 + r + -1r Combine like terms: r + -1r = 0 -18 + -1r = -7 + 0 -18 + -1r = -7 Add '18' to each side of the equation. -18 + 18 + -1r = -7 + 18 Combine like terms: -18 + 18 = 0 0 + -1r = -7 + 18 -1r = -7 + 18 Combine like terms: -7 + 18 = 11 -1r = 11 Divide each side by '-1'. r = -11 Simplifying r = -11
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