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Simplifying 42 = r + -12 Reorder the terms: 42 = -12 + r Solving 42 = -12 + 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. 42 + -1r = -12 + r + -1r Combine like terms: r + -1r = 0 42 + -1r = -12 + 0 42 + -1r = -12 Add '-42' to each side of the equation. 42 + -42 + -1r = -12 + -42 Combine like terms: 42 + -42 = 0 0 + -1r = -12 + -42 -1r = -12 + -42 Combine like terms: -12 + -42 = -54 -1r = -54 Divide each side by '-1'. r = 54 Simplifying r = 54
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