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