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Simplifying 16x + -3(4x + 7) = 6x + -2x + 21 Reorder the terms: 16x + -3(7 + 4x) = 6x + -2x + 21 16x + (7 * -3 + 4x * -3) = 6x + -2x + 21 16x + (-21 + -12x) = 6x + -2x + 21 Reorder the terms: -21 + 16x + -12x = 6x + -2x + 21 Combine like terms: 16x + -12x = 4x -21 + 4x = 6x + -2x + 21 Reorder the terms: -21 + 4x = 21 + 6x + -2x Combine like terms: 6x + -2x = 4x -21 + 4x = 21 + 4x Add '-4x' to each side of the equation. -21 + 4x + -4x = 21 + 4x + -4x Combine like terms: 4x + -4x = 0 -21 + 0 = 21 + 4x + -4x -21 = 21 + 4x + -4x Combine like terms: 4x + -4x = 0 -21 = 21 + 0 -21 = 21 Solving -21 = 21 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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