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Simplifying 80 = 2r + -7(11) Multiply -7 * 11 80 = 2r + -77 Reorder the terms: 80 = -77 + 2r Solving 80 = -77 + 2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2r' to each side of the equation. 80 + -2r = -77 + 2r + -2r Combine like terms: 2r + -2r = 0 80 + -2r = -77 + 0 80 + -2r = -77 Add '-80' to each side of the equation. 80 + -80 + -2r = -77 + -80 Combine like terms: 80 + -80 = 0 0 + -2r = -77 + -80 -2r = -77 + -80 Combine like terms: -77 + -80 = -157 -2r = -157 Divide each side by '-2'. r = 78.5 Simplifying r = 78.5
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