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Simplifying 100 = (16 + r) + r Remove parenthesis around (16 + r) 100 = 16 + r + r Combine like terms: r + r = 2r 100 = 16 + 2r Solving 100 = 16 + 2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2r' to each side of the equation. 100 + -2r = 16 + 2r + -2r Combine like terms: 2r + -2r = 0 100 + -2r = 16 + 0 100 + -2r = 16 Add '-100' to each side of the equation. 100 + -100 + -2r = 16 + -100 Combine like terms: 100 + -100 = 0 0 + -2r = 16 + -100 -2r = 16 + -100 Combine like terms: 16 + -100 = -84 -2r = -84 Divide each side by '-2'. r = 42 Simplifying r = 42
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