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Simplifying 3r + -9 = -8 + 4r Reorder the terms: -9 + 3r = -8 + 4r Solving -9 + 3r = -8 + 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. -9 + 3r + -4r = -8 + 4r + -4r Combine like terms: 3r + -4r = -1r -9 + -1r = -8 + 4r + -4r Combine like terms: 4r + -4r = 0 -9 + -1r = -8 + 0 -9 + -1r = -8 Add '9' to each side of the equation. -9 + 9 + -1r = -8 + 9 Combine like terms: -9 + 9 = 0 0 + -1r = -8 + 9 -1r = -8 + 9 Combine like terms: -8 + 9 = 1 -1r = 1 Divide each side by '-1'. r = -1 Simplifying r = -1
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