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Simplifying 4 + -8r = -4(5r + -1) Reorder the terms: 4 + -8r = -4(-1 + 5r) 4 + -8r = (-1 * -4 + 5r * -4) 4 + -8r = (4 + -20r) Add '-4' to each side of the equation. 4 + -4 + -8r = 4 + -4 + -20r Combine like terms: 4 + -4 = 0 0 + -8r = 4 + -4 + -20r -8r = 4 + -4 + -20r Combine like terms: 4 + -4 = 0 -8r = 0 + -20r -8r = -20r Solving -8r = -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. -8r + 20r = -20r + 20r Combine like terms: -8r + 20r = 12r 12r = -20r + 20r Combine like terms: -20r + 20r = 0 12r = 0 Divide each side by '12'. r = 0 Simplifying r = 0
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