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Simplifying 18 = 400(r) * 0.75 Reorder the terms for easier multiplication: 18 = 400 * 0.75r Multiply 400 * 0.75 18 = 300r Solving 18 = 300r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-300r' to each side of the equation. 18 + -300r = 300r + -300r Combine like terms: 300r + -300r = 0 18 + -300r = 0 Add '-18' to each side of the equation. 18 + -18 + -300r = 0 + -18 Combine like terms: 18 + -18 = 0 0 + -300r = 0 + -18 -300r = 0 + -18 Combine like terms: 0 + -18 = -18 -300r = -18 Divide each side by '-300'. r = 0.06 Simplifying r = 0.06
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