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Simplifying 3[x + -7] = x Reorder the terms: 3[-7 + x] = x [-7 * 3 + x * 3] = x [-21 + 3x] = x Solving -21 + 3x = x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. -21 + 3x + -1x = x + -1x Combine like terms: 3x + -1x = 2x -21 + 2x = x + -1x Combine like terms: x + -1x = 0 -21 + 2x = 0 Add '21' to each side of the equation. -21 + 21 + 2x = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 2x = 0 + 21 2x = 0 + 21 Combine like terms: 0 + 21 = 21 2x = 21 Divide each side by '2'. x = 10.5 Simplifying x = 10.5
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