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Simplifying -3r + -8 = -4r + 8 + -7 Reorder the terms: -8 + -3r = -4r + 8 + -7 Reorder the terms: -8 + -3r = 8 + -7 + -4r Combine like terms: 8 + -7 = 1 -8 + -3r = 1 + -4r Solving -8 + -3r = 1 + -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. -8 + -3r + 4r = 1 + -4r + 4r Combine like terms: -3r + 4r = 1r -8 + 1r = 1 + -4r + 4r Combine like terms: -4r + 4r = 0 -8 + 1r = 1 + 0 -8 + 1r = 1 Add '8' to each side of the equation. -8 + 8 + 1r = 1 + 8 Combine like terms: -8 + 8 = 0 0 + 1r = 1 + 8 1r = 1 + 8 Combine like terms: 1 + 8 = 9 1r = 9 Divide each side by '1'. r = 9 Simplifying r = 9
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