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Simplifying X + (99 + x) + (x + -75) = 390 Remove parenthesis around (99 + x) X + 99 + x + (x + -75) = 390 Reorder the terms: X + 99 + x + (-75 + x) = 390 Remove parenthesis around (-75 + x) X + 99 + x + -75 + x = 390 Reorder the terms: 99 + -75 + X + x + x = 390 Combine like terms: 99 + -75 = 24 24 + X + x + x = 390 Combine like terms: x + x = 2x 24 + X + 2x = 390 Solving 24 + X + 2x = 390 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-24' to each side of the equation. 24 + X + -24 + 2x = 390 + -24 Reorder the terms: 24 + -24 + X + 2x = 390 + -24 Combine like terms: 24 + -24 = 0 0 + X + 2x = 390 + -24 X + 2x = 390 + -24 Combine like terms: 390 + -24 = 366 X + 2x = 366 Add '-2x' to each side of the equation. X + 2x + -2x = 366 + -2x Combine like terms: 2x + -2x = 0 X + 0 = 366 + -2x X = 366 + -2x Simplifying X = 366 + -2x
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