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Simplifying -2(7r + 4) = 90 Reorder the terms: -2(4 + 7r) = 90 (4 * -2 + 7r * -2) = 90 (-8 + -14r) = 90 Solving -8 + -14r = 90 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + -14r = 90 + 8 Combine like terms: -8 + 8 = 0 0 + -14r = 90 + 8 -14r = 90 + 8 Combine like terms: 90 + 8 = 98 -14r = 98 Divide each side by '-14'. r = -7 Simplifying r = -7
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