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Simplifying 15 + 4b = 12b + -4(19 + -4b) 15 + 4b = 12b + (19 * -4 + -4b * -4) 15 + 4b = 12b + (-76 + 16b) Reorder the terms: 15 + 4b = -76 + 12b + 16b Combine like terms: 12b + 16b = 28b 15 + 4b = -76 + 28b Solving 15 + 4b = -76 + 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. 15 + 4b + -28b = -76 + 28b + -28b Combine like terms: 4b + -28b = -24b 15 + -24b = -76 + 28b + -28b Combine like terms: 28b + -28b = 0 15 + -24b = -76 + 0 15 + -24b = -76 Add '-15' to each side of the equation. 15 + -15 + -24b = -76 + -15 Combine like terms: 15 + -15 = 0 0 + -24b = -76 + -15 -24b = -76 + -15 Combine like terms: -76 + -15 = -91 -24b = -91 Divide each side by '-24'. b = 3.791666667 Simplifying b = 3.791666667
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