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Simplifying (X + 4) + -1(12 + -9x) = 0 Reorder the terms: (4 + X) + -1(12 + -9x) = 0 Remove parenthesis around (4 + X) 4 + X + -1(12 + -9x) = 0 4 + X + (12 * -1 + -9x * -1) = 0 4 + X + (-12 + 9x) = 0 Reorder the terms: 4 + -12 + X + 9x = 0 Combine like terms: 4 + -12 = -8 -8 + X + 9x = 0 Solving -8 + X + 9x = 0 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '8' to each side of the equation. -8 + X + 8 + 9x = 0 + 8 Reorder the terms: -8 + 8 + X + 9x = 0 + 8 Combine like terms: -8 + 8 = 0 0 + X + 9x = 0 + 8 X + 9x = 0 + 8 Combine like terms: 0 + 8 = 8 X + 9x = 8 Add '-9x' to each side of the equation. X + 9x + -9x = 8 + -9x Combine like terms: 9x + -9x = 0 X + 0 = 8 + -9x X = 8 + -9x Simplifying X = 8 + -9x
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