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Simplifying -7 + 9r = 8r + -4 Reorder the terms: -7 + 9r = -4 + 8r Solving -7 + 9r = -4 + 8r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8r' to each side of the equation. -7 + 9r + -8r = -4 + 8r + -8r Combine like terms: 9r + -8r = 1r -7 + 1r = -4 + 8r + -8r Combine like terms: 8r + -8r = 0 -7 + 1r = -4 + 0 -7 + 1r = -4 Add '7' to each side of the equation. -7 + 7 + 1r = -4 + 7 Combine like terms: -7 + 7 = 0 0 + 1r = -4 + 7 1r = -4 + 7 Combine like terms: -4 + 7 = 3 1r = 3 Divide each side by '1'. r = 3 Simplifying r = 3
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