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Simplifying 12x + -3(x + 7) = 8x Reorder the terms: 12x + -3(7 + x) = 8x 12x + (7 * -3 + x * -3) = 8x 12x + (-21 + -3x) = 8x Reorder the terms: -21 + 12x + -3x = 8x Combine like terms: 12x + -3x = 9x -21 + 9x = 8x Solving -21 + 9x = 8x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8x' to each side of the equation. -21 + 9x + -8x = 8x + -8x Combine like terms: 9x + -8x = 1x -21 + 1x = 8x + -8x Combine like terms: 8x + -8x = 0 -21 + 1x = 0 Add '21' to each side of the equation. -21 + 21 + 1x = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 1x = 0 + 21 1x = 0 + 21 Combine like terms: 0 + 21 = 21 1x = 21 Divide each side by '1'. x = 21 Simplifying x = 21
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