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Simplifying 5r + 3(1r + -7) = -85 Reorder the terms: 5r + 3(-7 + 1r) = -85 5r + (-7 * 3 + 1r * 3) = -85 5r + (-21 + 3r) = -85 Reorder the terms: -21 + 5r + 3r = -85 Combine like terms: 5r + 3r = 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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