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Simplifying 16 = r + 20 Reorder the terms: 16 = 20 + r Solving 16 = 20 + 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. 16 + -1r = 20 + r + -1r Combine like terms: r + -1r = 0 16 + -1r = 20 + 0 16 + -1r = 20 Add '-16' to each side of the equation. 16 + -16 + -1r = 20 + -16 Combine like terms: 16 + -16 = 0 0 + -1r = 20 + -16 -1r = 20 + -16 Combine like terms: 20 + -16 = 4 -1r = 4 Divide each side by '-1'. r = -4 Simplifying r = -4
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