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Simplifying -18 = r + -12 Reorder the terms: -18 = -12 + r Solving -18 = -12 + 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 = -12 + r + -1r Combine like terms: r + -1r = 0 -18 + -1r = -12 + 0 -18 + -1r = -12 Add '18' to each side of the equation. -18 + 18 + -1r = -12 + 18 Combine like terms: -18 + 18 = 0 0 + -1r = -12 + 18 -1r = -12 + 18 Combine like terms: -12 + 18 = 6 -1r = 6 Divide each side by '-1'. r = -6 Simplifying r = -6
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