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Simplifying 10 + -9r = -8r + 4 Reorder the terms: 10 + -9r = 4 + -8r Solving 10 + -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. 10 + -9r + 8r = 4 + -8r + 8r Combine like terms: -9r + 8r = -1r 10 + -1r = 4 + -8r + 8r Combine like terms: -8r + 8r = 0 10 + -1r = 4 + 0 10 + -1r = 4 Add '-10' to each side of the equation. 10 + -10 + -1r = 4 + -10 Combine like terms: 10 + -10 = 0 0 + -1r = 4 + -10 -1r = 4 + -10 Combine like terms: 4 + -10 = -6 -1r = -6 Divide each side by '-1'. r = 6 Simplifying r = 6
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