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Simplifying -4(-7 + 4r) = 28 + -8r (-7 * -4 + 4r * -4) = 28 + -8r (28 + -16r) = 28 + -8r Add '-28' to each side of the equation. 28 + -28 + -16r = 28 + -28 + -8r Combine like terms: 28 + -28 = 0 0 + -16r = 28 + -28 + -8r -16r = 28 + -28 + -8r Combine like terms: 28 + -28 = 0 -16r = 0 + -8r -16r = -8r Solving -16r = -8r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '8r' to each side of the equation. -16r + 8r = -8r + 8r Combine like terms: -16r + 8r = -8r -8r = -8r + 8r Combine like terms: -8r + 8r = 0 -8r = 0 Divide each side by '-8'. r = 0 Simplifying r = 0
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