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Simplifying 3(b + 7) + -5b = 3b + 21 + -5b Reorder the terms: 3(7 + b) + -5b = 3b + 21 + -5b (7 * 3 + b * 3) + -5b = 3b + 21 + -5b (21 + 3b) + -5b = 3b + 21 + -5b Combine like terms: 3b + -5b = -2b 21 + -2b = 3b + 21 + -5b Reorder the terms: 21 + -2b = 21 + 3b + -5b Combine like terms: 3b + -5b = -2b 21 + -2b = 21 + -2b Add '-21' to each side of the equation. 21 + -21 + -2b = 21 + -21 + -2b Combine like terms: 21 + -21 = 0 0 + -2b = 21 + -21 + -2b -2b = 21 + -21 + -2b Combine like terms: 21 + -21 = 0 -2b = 0 + -2b -2b = -2b Add '2b' to each side of the equation. -2b + 2b = -2b + 2b Combine like terms: -2b + 2b = 0 0 = -2b + 2b Combine like terms: -2b + 2b = 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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