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Simplifying 5 + -8(-5r + -1) = -148 Reorder the terms: 5 + -8(-1 + -5r) = -148 5 + (-1 * -8 + -5r * -8) = -148 5 + (8 + 40r) = -148 Combine like terms: 5 + 8 = 13 13 + 40r = -148 Solving 13 + 40r = -148 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + 40r = -148 + -13 Combine like terms: 13 + -13 = 0 0 + 40r = -148 + -13 40r = -148 + -13 Combine like terms: -148 + -13 = -161 40r = -161 Divide each side by '40'. r = -4.025 Simplifying r = -4.025
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