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Simplifying -3(-1x + 7) + 5x = 21 Reorder the terms: -3(7 + -1x) + 5x = 21 (7 * -3 + -1x * -3) + 5x = 21 (-21 + 3x) + 5x = 21 Combine like terms: 3x + 5x = 8x -21 + 8x = 21 Solving -21 + 8x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 8x = 21 + 21 Combine like terms: -21 + 21 = 0 0 + 8x = 21 + 21 8x = 21 + 21 Combine like terms: 21 + 21 = 42 8x = 42 Divide each side by '8'. x = 5.25 Simplifying x = 5.25
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