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Simplifying -7(2r + 3) + 11r = 0 Reorder the terms: -7(3 + 2r) + 11r = 0 (3 * -7 + 2r * -7) + 11r = 0 (-21 + -14r) + 11r = 0 Combine like terms: -14r + 11r = -3r -21 + -3r = 0 Solving -21 + -3r = 0 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 + -3r = 0 + 21 Combine like terms: -21 + 21 = 0 0 + -3r = 0 + 21 -3r = 0 + 21 Combine like terms: 0 + 21 = 21 -3r = 21 Divide each side by '-3'. r = -7 Simplifying r = -7
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