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Simplifying X + 12 + x + 21 = 90 Reorder the terms: 12 + 21 + X + x = 90 Combine like terms: 12 + 21 = 33 33 + X + x = 90 Solving 33 + X + x = 90 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-33' to each side of the equation. 33 + X + -33 + x = 90 + -33 Reorder the terms: 33 + -33 + X + x = 90 + -33 Combine like terms: 33 + -33 = 0 0 + X + x = 90 + -33 X + x = 90 + -33 Combine like terms: 90 + -33 = 57 X + x = 57 Add '-1x' to each side of the equation. X + x + -1x = 57 + -1x Combine like terms: x + -1x = 0 X + 0 = 57 + -1x X = 57 + -1x Simplifying X = 57 + -1x
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