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Simplifying 4 + 3r = 4(1 + -5r) 4 + 3r = (1 * 4 + -5r * 4) 4 + 3r = (4 + -20r) Add '-4' to each side of the equation. 4 + -4 + 3r = 4 + -4 + -20r Combine like terms: 4 + -4 = 0 0 + 3r = 4 + -4 + -20r 3r = 4 + -4 + -20r Combine like terms: 4 + -4 = 0 3r = 0 + -20r 3r = -20r Solving 3r = -20r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '20r' to each side of the equation. 3r + 20r = -20r + 20r Combine like terms: 3r + 20r = 23r 23r = -20r + 20r Combine like terms: -20r + 20r = 0 23r = 0 Divide each side by '23'. r = 0 Simplifying r = 0
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