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Simplifying 9 + -4r = -18 Solving 9 + -4r = -18 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -4r = -18 + -9 Combine like terms: 9 + -9 = 0 0 + -4r = -18 + -9 -4r = -18 + -9 Combine like terms: -18 + -9 = -27 -4r = -27 Divide each side by '-4'. r = 6.75 Simplifying r = 6.75
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