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Simplifying 857 = r + 819 Reorder the terms: 857 = 819 + r Solving 857 = 819 + 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. 857 + -1r = 819 + r + -1r Combine like terms: r + -1r = 0 857 + -1r = 819 + 0 857 + -1r = 819 Add '-857' to each side of the equation. 857 + -857 + -1r = 819 + -857 Combine like terms: 857 + -857 = 0 0 + -1r = 819 + -857 -1r = 819 + -857 Combine like terms: 819 + -857 = -38 -1r = -38 Divide each side by '-1'. r = 38 Simplifying r = 38
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