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Simplifying -8r + 7(8r + -1) = -199 Reorder the terms: -8r + 7(-1 + 8r) = -199 -8r + (-1 * 7 + 8r * 7) = -199 -8r + (-7 + 56r) = -199 Reorder the terms: -7 + -8r + 56r = -199 Combine like terms: -8r + 56r = 48r -7 + 48r = -199 Solving -7 + 48r = -199 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 48r = -199 + 7 Combine like terms: -7 + 7 = 0 0 + 48r = -199 + 7 48r = -199 + 7 Combine like terms: -199 + 7 = -192 48r = -192 Divide each side by '48'. r = -4 Simplifying r = -4
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