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Simplifying 4r + -4(4r + 5) = -104 Reorder the terms: 4r + -4(5 + 4r) = -104 4r + (5 * -4 + 4r * -4) = -104 4r + (-20 + -16r) = -104 Reorder the terms: -20 + 4r + -16r = -104 Combine like terms: 4r + -16r = -12r -20 + -12r = -104 Solving -20 + -12r = -104 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + -12r = -104 + 20 Combine like terms: -20 + 20 = 0 0 + -12r = -104 + 20 -12r = -104 + 20 Combine like terms: -104 + 20 = -84 -12r = -84 Divide each side by '-12'. r = 7 Simplifying r = 7
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