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Simplifying 56 + -5(21 + r) = 0 56 + (21 * -5 + r * -5) = 0 56 + (-105 + -5r) = 0 Combine like terms: 56 + -105 = -49 -49 + -5r = 0 Solving -49 + -5r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '49' to each side of the equation. -49 + 49 + -5r = 0 + 49 Combine like terms: -49 + 49 = 0 0 + -5r = 0 + 49 -5r = 0 + 49 Combine like terms: 0 + 49 = 49 -5r = 49 Divide each side by '-5'. r = -9.8 Simplifying r = -9.8
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