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Simplifying -18 = 2.5r + 12 Reorder the terms: -18 = 12 + 2.5r Solving -18 = 12 + 2.5r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2.5r' to each side of the equation. -18 + -2.5r = 12 + 2.5r + -2.5r Combine like terms: 2.5r + -2.5r = 0.0 -18 + -2.5r = 12 + 0.0 -18 + -2.5r = 12 Add '18' to each side of the equation. -18 + 18 + -2.5r = 12 + 18 Combine like terms: -18 + 18 = 0 0 + -2.5r = 12 + 18 -2.5r = 12 + 18 Combine like terms: 12 + 18 = 30 -2.5r = 30 Divide each side by '-2.5'. r = -12 Simplifying r = -12
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