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Simplifying 17r + 4r = -7(7r + -8) Combine like terms: 17r + 4r = 21r 21r = -7(7r + -8) Reorder the terms: 21r = -7(-8 + 7r) 21r = (-8 * -7 + 7r * -7) 21r = (56 + -49r) Solving 21r = 56 + -49r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '49r' to each side of the equation. 21r + 49r = 56 + -49r + 49r Combine like terms: 21r + 49r = 70r 70r = 56 + -49r + 49r Combine like terms: -49r + 49r = 0 70r = 56 + 0 70r = 56 Divide each side by '70'. r = 0.8 Simplifying r = 0.8
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