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Simplifying 8x + -1(4X + 7) = 21 Reorder the terms: 8x + -1(7 + 4X) = 21 8x + (7 * -1 + 4X * -1) = 21 8x + (-7 + -4X) = 21 Reorder the terms: -7 + -4X + 8x = 21 Solving -7 + -4X + 8x = 21 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '7' to each side of the equation. -7 + -4X + 7 + 8x = 21 + 7 Reorder the terms: -7 + 7 + -4X + 8x = 21 + 7 Combine like terms: -7 + 7 = 0 0 + -4X + 8x = 21 + 7 -4X + 8x = 21 + 7 Combine like terms: 21 + 7 = 28 -4X + 8x = 28 Add '-8x' to each side of the equation. -4X + 8x + -8x = 28 + -8x Combine like terms: 8x + -8x = 0 -4X + 0 = 28 + -8x -4X = 28 + -8x Divide each side by '-4'. X = -7 + 2x Simplifying X = -7 + 2x
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