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Simplifying X + -3(x + -7) = 9 Reorder the terms: X + -3(-7 + x) = 9 X + (-7 * -3 + x * -3) = 9 X + (21 + -3x) = 9 Reorder the terms: 21 + X + -3x = 9 Solving 21 + X + -3x = 9 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 + X + -21 + -3x = 9 + -21 Reorder the terms: 21 + -21 + X + -3x = 9 + -21 Combine like terms: 21 + -21 = 0 0 + X + -3x = 9 + -21 X + -3x = 9 + -21 Combine like terms: 9 + -21 = -12 X + -3x = -12 Add '3x' to each side of the equation. X + -3x + 3x = -12 + 3x Combine like terms: -3x + 3x = 0 X + 0 = -12 + 3x X = -12 + 3x Simplifying X = -12 + 3x
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