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Simplifying 8(-8r + -1) + -1(2r + -8) = -66 Reorder the terms: 8(-1 + -8r) + -1(2r + -8) = -66 (-1 * 8 + -8r * 8) + -1(2r + -8) = -66 (-8 + -64r) + -1(2r + -8) = -66 Reorder the terms: -8 + -64r + -1(-8 + 2r) = -66 -8 + -64r + (-8 * -1 + 2r * -1) = -66 -8 + -64r + (8 + -2r) = -66 Reorder the terms: -8 + 8 + -64r + -2r = -66 Combine like terms: -8 + 8 = 0 0 + -64r + -2r = -66 -64r + -2r = -66 Combine like terms: -64r + -2r = -66r -66r = -66 Solving -66r = -66 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Divide each side by '-66'. r = 1 Simplifying r = 1
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