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Simplifying 124 = -4(-7 + 4r) 124 = (-7 * -4 + 4r * -4) 124 = (28 + -16r) Solving 124 = 28 + -16r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '16r' to each side of the equation. 124 + 16r = 28 + -16r + 16r Combine like terms: -16r + 16r = 0 124 + 16r = 28 + 0 124 + 16r = 28 Add '-124' to each side of the equation. 124 + -124 + 16r = 28 + -124 Combine like terms: 124 + -124 = 0 0 + 16r = 28 + -124 16r = 28 + -124 Combine like terms: 28 + -124 = -96 16r = -96 Divide each side by '16'. r = -6 Simplifying r = -6
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