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Simplifying 13 = -3(21 + -1b) + 2(b + -2) 13 = (21 * -3 + -1b * -3) + 2(b + -2) 13 = (-63 + 3b) + 2(b + -2) Reorder the terms: 13 = -63 + 3b + 2(-2 + b) 13 = -63 + 3b + (-2 * 2 + b * 2) 13 = -63 + 3b + (-4 + 2b) Reorder the terms: 13 = -63 + -4 + 3b + 2b Combine like terms: -63 + -4 = -67 13 = -67 + 3b + 2b Combine like terms: 3b + 2b = 5b 13 = -67 + 5b Solving 13 = -67 + 5b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-5b' to each side of the equation. 13 + -5b = -67 + 5b + -5b Combine like terms: 5b + -5b = 0 13 + -5b = -67 + 0 13 + -5b = -67 Add '-13' to each side of the equation. 13 + -13 + -5b = -67 + -13 Combine like terms: 13 + -13 = 0 0 + -5b = -67 + -13 -5b = -67 + -13 Combine like terms: -67 + -13 = -80 -5b = -80 Divide each side by '-5'. b = 16 Simplifying b = 16
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