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Simplifying 8x + -3(4 + -1x) = 21 8x + (4 * -3 + -1x * -3) = 21 8x + (-12 + 3x) = 21 Reorder the terms: -12 + 8x + 3x = 21 Combine like terms: 8x + 3x = 11x -12 + 11x = 21 Solving -12 + 11x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 11x = 21 + 12 Combine like terms: -12 + 12 = 0 0 + 11x = 21 + 12 11x = 21 + 12 Combine like terms: 21 + 12 = 33 11x = 33 Divide each side by '11'. x = 3 Simplifying x = 3
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