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Simplifying 19 = r + 12 Reorder the terms: 19 = 12 + r Solving 19 = 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. 19 + -1r = 12 + r + -1r Combine like terms: r + -1r = 0 19 + -1r = 12 + 0 19 + -1r = 12 Add '-19' to each side of the equation. 19 + -19 + -1r = 12 + -19 Combine like terms: 19 + -19 = 0 0 + -1r = 12 + -19 -1r = 12 + -19 Combine like terms: 12 + -19 = -7 -1r = -7 Divide each side by '-1'. r = 7 Simplifying r = 7
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