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Simplifying 21x + -3 = 2(7x + -4) + 7x + 5 Reorder the terms: -3 + 21x = 2(7x + -4) + 7x + 5 Reorder the terms: -3 + 21x = 2(-4 + 7x) + 7x + 5 -3 + 21x = (-4 * 2 + 7x * 2) + 7x + 5 -3 + 21x = (-8 + 14x) + 7x + 5 Reorder the terms: -3 + 21x = -8 + 5 + 14x + 7x Combine like terms: -8 + 5 = -3 -3 + 21x = -3 + 14x + 7x Combine like terms: 14x + 7x = 21x -3 + 21x = -3 + 21x Add '3' to each side of the equation. -3 + 3 + 21x = -3 + 3 + 21x Combine like terms: -3 + 3 = 0 0 + 21x = -3 + 3 + 21x 21x = -3 + 3 + 21x Combine like terms: -3 + 3 = 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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