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Simplifying 12 = r + (-3) 12 = r + -3 Reorder the terms: 12 = -3 + r Solving 12 = -3 + 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. 12 + -1r = -3 + r + -1r Combine like terms: r + -1r = 0 12 + -1r = -3 + 0 12 + -1r = -3 Add '-12' to each side of the equation. 12 + -12 + -1r = -3 + -12 Combine like terms: 12 + -12 = 0 0 + -1r = -3 + -12 -1r = -3 + -12 Combine like terms: -3 + -12 = -15 -1r = -15 Divide each side by '-1'. r = 15 Simplifying r = 15
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