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Simplifying X + 3x + -7 = 21 Reorder the terms: -7 + X + 3x = 21 Solving -7 + X + 3x = 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 + X + 7 + 3x = 21 + 7 Reorder the terms: -7 + 7 + X + 3x = 21 + 7 Combine like terms: -7 + 7 = 0 0 + X + 3x = 21 + 7 X + 3x = 21 + 7 Combine like terms: 21 + 7 = 28 X + 3x = 28 Add '-3x' to each side of the equation. X + 3x + -3x = 28 + -3x Combine like terms: 3x + -3x = 0 X + 0 = 28 + -3x X = 28 + -3x Simplifying X = 28 + -3x
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