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Simplifying -18 = 5r + -4r Combine like terms: 5r + -4r = 1r -18 = 1r Solving -18 = 1r 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 = 1r + -1r Combine like terms: 1r + -1r = 0 -18 + -1r = 0 Add '18' to each side of the equation. -18 + 18 + -1r = 0 + 18 Combine like terms: -18 + 18 = 0 0 + -1r = 0 + 18 -1r = 0 + 18 Combine like terms: 0 + 18 = 18 -1r = 18 Divide each side by '-1'. r = -18 Simplifying r = -18
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