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Simplifying -400 = -8(r + -8) Reorder the terms: -400 = -8(-8 + r) -400 = (-8 * -8 + r * -8) -400 = (64 + -8r) Solving -400 = 64 + -8r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '8r' to each side of the equation. -400 + 8r = 64 + -8r + 8r Combine like terms: -8r + 8r = 0 -400 + 8r = 64 + 0 -400 + 8r = 64 Add '400' to each side of the equation. -400 + 400 + 8r = 64 + 400 Combine like terms: -400 + 400 = 0 0 + 8r = 64 + 400 8r = 64 + 400 Combine like terms: 64 + 400 = 464 8r = 464 Divide each side by '8'. r = 58 Simplifying r = 58
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