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Simplifying 1 + -2(4r + 7) = 0 Reorder the terms: 1 + -2(7 + 4r) = 0 1 + (7 * -2 + 4r * -2) = 0 1 + (-14 + -8r) = 0 Combine like terms: 1 + -14 = -13 -13 + -8r = 0 Solving -13 + -8r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + -8r = 0 + 13 Combine like terms: -13 + 13 = 0 0 + -8r = 0 + 13 -8r = 0 + 13 Combine like terms: 0 + 13 = 13 -8r = 13 Divide each side by '-8'. r = -1.625 Simplifying r = -1.625
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