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Simplifying 3(7x + -8) + 4 = 21x + -20 Reorder the terms: 3(-8 + 7x) + 4 = 21x + -20 (-8 * 3 + 7x * 3) + 4 = 21x + -20 (-24 + 21x) + 4 = 21x + -20 Reorder the terms: -24 + 4 + 21x = 21x + -20 Combine like terms: -24 + 4 = -20 -20 + 21x = 21x + -20 Reorder the terms: -20 + 21x = -20 + 21x Add '20' to each side of the equation. -20 + 20 + 21x = -20 + 20 + 21x Combine like terms: -20 + 20 = 0 0 + 21x = -20 + 20 + 21x 21x = -20 + 20 + 21x Combine like terms: -20 + 20 = 0 21x = 0 + 21x 21x = 21x Add '-21x' to each side of the equation. 21x + -21x = 21x + -21x Combine like terms: 21x + -21x = 0 0 = 21x + -21x Combine like terms: 21x + -21x = 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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