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Simplifying -28 + -7b = -7(-8 + 4b) -28 + -7b = (-8 * -7 + 4b * -7) -28 + -7b = (56 + -28b) Solving -28 + -7b = 56 + -28b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '28b' to each side of the equation. -28 + -7b + 28b = 56 + -28b + 28b Combine like terms: -7b + 28b = 21b -28 + 21b = 56 + -28b + 28b Combine like terms: -28b + 28b = 0 -28 + 21b = 56 + 0 -28 + 21b = 56 Add '28' to each side of the equation. -28 + 28 + 21b = 56 + 28 Combine like terms: -28 + 28 = 0 0 + 21b = 56 + 28 21b = 56 + 28 Combine like terms: 56 + 28 = 84 21b = 84 Divide each side by '21'. b = 4 Simplifying b = 4
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