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Simplifying -3(2b + -7) = -3b + 21 + -3b Reorder the terms: -3(-7 + 2b) = -3b + 21 + -3b (-7 * -3 + 2b * -3) = -3b + 21 + -3b (21 + -6b) = -3b + 21 + -3b Reorder the terms: 21 + -6b = 21 + -3b + -3b Combine like terms: -3b + -3b = -6b 21 + -6b = 21 + -6b Add '-21' to each side of the equation. 21 + -21 + -6b = 21 + -21 + -6b Combine like terms: 21 + -21 = 0 0 + -6b = 21 + -21 + -6b -6b = 21 + -21 + -6b Combine like terms: 21 + -21 = 0 -6b = 0 + -6b -6b = -6b Add '6b' to each side of the equation. -6b + 6b = -6b + 6b Combine like terms: -6b + 6b = 0 0 = -6b + 6b Combine like terms: -6b + 6b = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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