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Simplifying 4r + -12 + 5r = -12 + r Reorder the terms: -12 + 4r + 5r = -12 + r Combine like terms: 4r + 5r = 9r -12 + 9r = -12 + r Add '12' to each side of the equation. -12 + 12 + 9r = -12 + 12 + r Combine like terms: -12 + 12 = 0 0 + 9r = -12 + 12 + r 9r = -12 + 12 + r Combine like terms: -12 + 12 = 0 9r = 0 + r 9r = r Solving 9r = r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. 9r + -1r = r + -1r Combine like terms: 9r + -1r = 8r 8r = r + -1r Combine like terms: r + -1r = 0 8r = 0 Divide each side by '8'. r = 0 Simplifying r = 0
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