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Simplifying -4(-7r + -3) = 12 + -7r Reorder the terms: -4(-3 + -7r) = 12 + -7r (-3 * -4 + -7r * -4) = 12 + -7r (12 + 28r) = 12 + -7r Add '-12' to each side of the equation. 12 + -12 + 28r = 12 + -12 + -7r Combine like terms: 12 + -12 = 0 0 + 28r = 12 + -12 + -7r 28r = 12 + -12 + -7r Combine like terms: 12 + -12 = 0 28r = 0 + -7r 28r = -7r Solving 28r = -7r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '7r' to each side of the equation. 28r + 7r = -7r + 7r Combine like terms: 28r + 7r = 35r 35r = -7r + 7r Combine like terms: -7r + 7r = 0 35r = 0 Divide each side by '35'. r = 0 Simplifying r = 0
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