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Simplifying (X + 21) + (2x + -9) = 90 Reorder the terms: (21 + X) + (2x + -9) = 90 Remove parenthesis around (21 + X) 21 + X + (2x + -9) = 90 Reorder the terms: 21 + X + (-9 + 2x) = 90 Remove parenthesis around (-9 + 2x) 21 + X + -9 + 2x = 90 Reorder the terms: 21 + -9 + X + 2x = 90 Combine like terms: 21 + -9 = 12 12 + X + 2x = 90 Solving 12 + X + 2x = 90 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + X + -12 + 2x = 90 + -12 Reorder the terms: 12 + -12 + X + 2x = 90 + -12 Combine like terms: 12 + -12 = 0 0 + X + 2x = 90 + -12 X + 2x = 90 + -12 Combine like terms: 90 + -12 = 78 X + 2x = 78 Add '-2x' to each side of the equation. X + 2x + -2x = 78 + -2x Combine like terms: 2x + -2x = 0 X + 0 = 78 + -2x X = 78 + -2x Simplifying X = 78 + -2x
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