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Simplifying X + x + 3x + -7 + 3x + -7 + 3x + -7 + 3x + -7 = 28 Reorder the terms: -7 + -7 + -7 + -7 + X + x + 3x + 3x + 3x + 3x = 28 Combine like terms: -7 + -7 = -14 -14 + -7 + -7 + X + x + 3x + 3x + 3x + 3x = 28 Combine like terms: -14 + -7 = -21 -21 + -7 + X + x + 3x + 3x + 3x + 3x = 28 Combine like terms: -21 + -7 = -28 -28 + X + x + 3x + 3x + 3x + 3x = 28 Combine like terms: x + 3x = 4x -28 + X + 4x + 3x + 3x + 3x = 28 Combine like terms: 4x + 3x = 7x -28 + X + 7x + 3x + 3x = 28 Combine like terms: 7x + 3x = 10x -28 + X + 10x + 3x = 28 Combine like terms: 10x + 3x = 13x -28 + X + 13x = 28 Solving -28 + X + 13x = 28 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '28' to each side of the equation. -28 + X + 28 + 13x = 28 + 28 Reorder the terms: -28 + 28 + X + 13x = 28 + 28 Combine like terms: -28 + 28 = 0 0 + X + 13x = 28 + 28 X + 13x = 28 + 28 Combine like terms: 28 + 28 = 56 X + 13x = 56 Add '-13x' to each side of the equation. X + 13x + -13x = 56 + -13x Combine like terms: 13x + -13x = 0 X + 0 = 56 + -13x X = 56 + -13x Simplifying X = 56 + -13x
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