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Simplifying 5r + 15r + 4 = 20 + 19r Reorder the terms: 4 + 5r + 15r = 20 + 19r Combine like terms: 5r + 15r = 20r 4 + 20r = 20 + 19r Solving 4 + 20r = 20 + 19r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-19r' to each side of the equation. 4 + 20r + -19r = 20 + 19r + -19r Combine like terms: 20r + -19r = 1r 4 + 1r = 20 + 19r + -19r Combine like terms: 19r + -19r = 0 4 + 1r = 20 + 0 4 + 1r = 20 Add '-4' to each side of the equation. 4 + -4 + 1r = 20 + -4 Combine like terms: 4 + -4 = 0 0 + 1r = 20 + -4 1r = 20 + -4 Combine like terms: 20 + -4 = 16 1r = 16 Divide each side by '1'. r = 16 Simplifying r = 16
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