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Simplifying -1 + -1r = 8(r + -8) Reorder the terms: -1 + -1r = 8(-8 + r) -1 + -1r = (-8 * 8 + r * 8) -1 + -1r = (-64 + 8r) Solving -1 + -1r = -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. -1 + -1r + -8r = -64 + 8r + -8r Combine like terms: -1r + -8r = -9r -1 + -9r = -64 + 8r + -8r Combine like terms: 8r + -8r = 0 -1 + -9r = -64 + 0 -1 + -9r = -64 Add '1' to each side of the equation. -1 + 1 + -9r = -64 + 1 Combine like terms: -1 + 1 = 0 0 + -9r = -64 + 1 -9r = -64 + 1 Combine like terms: -64 + 1 = -63 -9r = -63 Divide each side by '-9'. r = 7 Simplifying r = 7
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