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Simplifying 9r + 4r + 6 + -2 = 9r + 4 + 3r Reorder the terms: 6 + -2 + 9r + 4r = 9r + 4 + 3r Combine like terms: 6 + -2 = 4 4 + 9r + 4r = 9r + 4 + 3r Combine like terms: 9r + 4r = 13r 4 + 13r = 9r + 4 + 3r Reorder the terms: 4 + 13r = 4 + 9r + 3r Combine like terms: 9r + 3r = 12r 4 + 13r = 4 + 12r Add '-4' to each side of the equation. 4 + -4 + 13r = 4 + -4 + 12r Combine like terms: 4 + -4 = 0 0 + 13r = 4 + -4 + 12r 13r = 4 + -4 + 12r Combine like terms: 4 + -4 = 0 13r = 0 + 12r 13r = 12r Solving 13r = 12r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-12r' to each side of the equation. 13r + -12r = 12r + -12r Combine like terms: 13r + -12r = 1r 1r = 12r + -12r Combine like terms: 12r + -12r = 0 1r = 0 Divide each side by '1'. r = 0 Simplifying r = 0
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