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Simplifying -3b + 4 = 9b + -7 + -12b + 21 Reorder the terms: 4 + -3b = 9b + -7 + -12b + 21 Reorder the terms: 4 + -3b = -7 + 21 + 9b + -12b Combine like terms: -7 + 21 = 14 4 + -3b = 14 + 9b + -12b Combine like terms: 9b + -12b = -3b 4 + -3b = 14 + -3b Add '3b' to each side of the equation. 4 + -3b + 3b = 14 + -3b + 3b Combine like terms: -3b + 3b = 0 4 + 0 = 14 + -3b + 3b 4 = 14 + -3b + 3b Combine like terms: -3b + 3b = 0 4 = 14 + 0 4 = 14 Solving 4 = 14 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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