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Simplifying -40 + 8r = -4(1 + -5r) -40 + 8r = (1 * -4 + -5r * -4) -40 + 8r = (-4 + 20r) Solving -40 + 8r = -4 + 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. -40 + 8r + -20r = -4 + 20r + -20r Combine like terms: 8r + -20r = -12r -40 + -12r = -4 + 20r + -20r Combine like terms: 20r + -20r = 0 -40 + -12r = -4 + 0 -40 + -12r = -4 Add '40' to each side of the equation. -40 + 40 + -12r = -4 + 40 Combine like terms: -40 + 40 = 0 0 + -12r = -4 + 40 -12r = -4 + 40 Combine like terms: -4 + 40 = 36 -12r = 36 Divide each side by '-12'. r = -3 Simplifying r = -3
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