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Simplifying -1r + 7(-1r + -3) = -85 Reorder the terms: -1r + 7(-3 + -1r) = -85 -1r + (-3 * 7 + -1r * 7) = -85 -1r + (-21 + -7r) = -85 Reorder the terms: -21 + -1r + -7r = -85 Combine like terms: -1r + -7r = -8r -21 + -8r = -85 Solving -21 + -8r = -85 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + -8r = -85 + 21 Combine like terms: -21 + 21 = 0 0 + -8r = -85 + 21 -8r = -85 + 21 Combine like terms: -85 + 21 = -64 -8r = -64 Divide each side by '-8'. r = 8 Simplifying r = 8
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