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Simplifying 13 + -1r = 12 Solving 13 + -1r = 12 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 + -1r = 12 + -13 Combine like terms: 13 + -13 = 0 0 + -1r = 12 + -13 -1r = 12 + -13 Combine like terms: 12 + -13 = -1 -1r = -1 Divide each side by '-1'. r = 1 Simplifying r = 1
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