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Simplifying 16x + -3[4x + 7] = 6x + -1[2x + 21] Reorder the terms: 16x + -3[7 + 4x] = 6x + -1[2x + 21] 16x + [7 * -3 + 4x * -3] = 6x + -1[2x + 21] 16x + [-21 + -12x] = 6x + -1[2x + 21] Reorder the terms: -21 + 16x + -12x = 6x + -1[2x + 21] Combine like terms: 16x + -12x = 4x -21 + 4x = 6x + -1[2x + 21] Reorder the terms: -21 + 4x = 6x + -1[21 + 2x] -21 + 4x = 6x + [21 * -1 + 2x * -1] -21 + 4x = 6x + [-21 + -2x] Reorder the terms: -21 + 4x = -21 + 6x + -2x Combine like terms: 6x + -2x = 4x -21 + 4x = -21 + 4x Add '21' to each side of the equation. -21 + 21 + 4x = -21 + 21 + 4x Combine like terms: -21 + 21 = 0 0 + 4x = -21 + 21 + 4x 4x = -21 + 21 + 4x Combine like terms: -21 + 21 = 0 4x = 0 + 4x 4x = 4x Add '-4x' to each side of the equation. 4x + -4x = 4x + -4x Combine like terms: 4x + -4x = 0 0 = 4x + -4x Combine like terms: 4x + -4x = 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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