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Simplifying 19 = 4r + -9 Reorder the terms: 19 = -9 + 4r Solving 19 = -9 + 4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4r' to each side of the equation. 19 + -4r = -9 + 4r + -4r Combine like terms: 4r + -4r = 0 19 + -4r = -9 + 0 19 + -4r = -9 Add '-19' to each side of the equation. 19 + -19 + -4r = -9 + -19 Combine like terms: 19 + -19 = 0 0 + -4r = -9 + -19 -4r = -9 + -19 Combine like terms: -9 + -19 = -28 -4r = -28 Divide each side by '-4'. r = 7 Simplifying r = 7
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