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Simplifying 5 + 5(-7r + -3) = -255 Reorder the terms: 5 + 5(-3 + -7r) = -255 5 + (-3 * 5 + -7r * 5) = -255 5 + (-15 + -35r) = -255 Combine like terms: 5 + -15 = -10 -10 + -35r = -255 Solving -10 + -35r = -255 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + -35r = -255 + 10 Combine like terms: -10 + 10 = 0 0 + -35r = -255 + 10 -35r = -255 + 10 Combine like terms: -255 + 10 = -245 -35r = -245 Divide each side by '-35'. r = 7 Simplifying r = 7
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