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Simplifying -371 = -7(-3 + 8r) -371 = (-3 * -7 + 8r * -7) -371 = (21 + -56r) Solving -371 = 21 + -56r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '56r' to each side of the equation. -371 + 56r = 21 + -56r + 56r Combine like terms: -56r + 56r = 0 -371 + 56r = 21 + 0 -371 + 56r = 21 Add '371' to each side of the equation. -371 + 371 + 56r = 21 + 371 Combine like terms: -371 + 371 = 0 0 + 56r = 21 + 371 56r = 21 + 371 Combine like terms: 21 + 371 = 392 56r = 392 Divide each side by '56'. r = 7 Simplifying r = 7
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