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Simplifying 13r + -13r + -12r + -13 = 11 Reorder the terms: -13 + 13r + -13r + -12r = 11 Combine like terms: 13r + -13r = 0 -13 + 0 + -12r = 11 -13 + -12r = 11 Solving -13 + -12r = 11 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + -12r = 11 + 13 Combine like terms: -13 + 13 = 0 0 + -12r = 11 + 13 -12r = 11 + 13 Combine like terms: 11 + 13 = 24 -12r = 24 Divide each side by '-12'. r = -2 Simplifying r = -2
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