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Simplifying [13 + -1(6 + -1b)] + (8 + -1b) = 8 [13 + (6 * -1 + -1b * -1)] + (8 + -1b) = 8 [13 + (-6 + 1b)] + (8 + -1b) = 8 Combine like terms: 13 + -6 = 7 [7 + 1b] + (8 + -1b) = 8 Remove brackets around [7 + 1b] 7 + 1b + (8 + -1b) = 8 Remove parenthesis around (8 + -1b) 7 + 1b + 8 + -1b = 8 Reorder the terms: 7 + 8 + 1b + -1b = 8 Combine like terms: 7 + 8 = 15 15 + 1b + -1b = 8 Combine like terms: 1b + -1b = 0 15 + 0 = 8 15 = 8 Solving 15 = 8 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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