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Simplifying 21(b + -1) + 3 = 3(7b + -6) Reorder the terms: 21(-1 + b) + 3 = 3(7b + -6) (-1 * 21 + b * 21) + 3 = 3(7b + -6) (-21 + 21b) + 3 = 3(7b + -6) Reorder the terms: -21 + 3 + 21b = 3(7b + -6) Combine like terms: -21 + 3 = -18 -18 + 21b = 3(7b + -6) Reorder the terms: -18 + 21b = 3(-6 + 7b) -18 + 21b = (-6 * 3 + 7b * 3) -18 + 21b = (-18 + 21b) Add '18' to each side of the equation. -18 + 18 + 21b = -18 + 18 + 21b Combine like terms: -18 + 18 = 0 0 + 21b = -18 + 18 + 21b 21b = -18 + 18 + 21b Combine like terms: -18 + 18 = 0 21b = 0 + 21b 21b = 21b Add '-21b' to each side of the equation. 21b + -21b = 21b + -21b Combine like terms: 21b + -21b = 0 0 = 21b + -21b Combine like terms: 21b + -21b = 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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