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Simplifying -7(3x + -4) + 4 = -21x + 32 Reorder the terms: -7(-4 + 3x) + 4 = -21x + 32 (-4 * -7 + 3x * -7) + 4 = -21x + 32 (28 + -21x) + 4 = -21x + 32 Reorder the terms: 28 + 4 + -21x = -21x + 32 Combine like terms: 28 + 4 = 32 32 + -21x = -21x + 32 Reorder the terms: 32 + -21x = 32 + -21x Add '-32' to each side of the equation. 32 + -32 + -21x = 32 + -32 + -21x Combine like terms: 32 + -32 = 0 0 + -21x = 32 + -32 + -21x -21x = 32 + -32 + -21x Combine like terms: 32 + -32 = 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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