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Simplifying X + 21 + 3x + -15 = 90 Reorder the terms: 21 + -15 + X + 3x = 90 Combine like terms: 21 + -15 = 6 6 + X + 3x = 90 Solving 6 + X + 3x = 90 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + X + -6 + 3x = 90 + -6 Reorder the terms: 6 + -6 + X + 3x = 90 + -6 Combine like terms: 6 + -6 = 0 0 + X + 3x = 90 + -6 X + 3x = 90 + -6 Combine like terms: 90 + -6 = 84 X + 3x = 84 Add '-3x' to each side of the equation. X + 3x + -3x = 84 + -3x Combine like terms: 3x + -3x = 0 X + 0 = 84 + -3x X = 84 + -3x Simplifying X = 84 + -3x
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