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Simplifying -4(10 + -10r) + 7 = 0 (10 * -4 + -10r * -4) + 7 = 0 (-40 + 40r) + 7 = 0 Reorder the terms: -40 + 7 + 40r = 0 Combine like terms: -40 + 7 = -33 -33 + 40r = 0 Solving -33 + 40r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '33' to each side of the equation. -33 + 33 + 40r = 0 + 33 Combine like terms: -33 + 33 = 0 0 + 40r = 0 + 33 40r = 0 + 33 Combine like terms: 0 + 33 = 33 40r = 33 Divide each side by '40'. r = 0.825 Simplifying r = 0.825
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