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Simplifying 420 = (r + 10) Reorder the terms: 420 = (10 + r) Remove parenthesis around (10 + r) 420 = 10 + r Solving 420 = 10 + 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. 420 + -1r = 10 + r + -1r Combine like terms: r + -1r = 0 420 + -1r = 10 + 0 420 + -1r = 10 Add '-420' to each side of the equation. 420 + -420 + -1r = 10 + -420 Combine like terms: 420 + -420 = 0 0 + -1r = 10 + -420 -1r = 10 + -420 Combine like terms: 10 + -420 = -410 -1r = -410 Divide each side by '-1'. r = 410 Simplifying r = 410
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