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Simplifying 3(-40 + -2r) + 20 = 0 (-40 * 3 + -2r * 3) + 20 = 0 (-120 + -6r) + 20 = 0 Reorder the terms: -120 + 20 + -6r = 0 Combine like terms: -120 + 20 = -100 -100 + -6r = 0 Solving -100 + -6r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '100' to each side of the equation. -100 + 100 + -6r = 0 + 100 Combine like terms: -100 + 100 = 0 0 + -6r = 0 + 100 -6r = 0 + 100 Combine like terms: 0 + 100 = 100 -6r = 100 Divide each side by '-6'. r = -16.66666667 Simplifying r = -16.66666667
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