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Simplifying 9x + -4[x + -2] = x + 20 Reorder the terms: 9x + -4[-2 + x] = x + 20 9x + [-2 * -4 + x * -4] = x + 20 9x + [8 + -4x] = x + 20 Reorder the terms: 8 + 9x + -4x = x + 20 Combine like terms: 9x + -4x = 5x 8 + 5x = x + 20 Reorder the terms: 8 + 5x = 20 + x Solving 8 + 5x = 20 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 8 + 5x + -1x = 20 + x + -1x Combine like terms: 5x + -1x = 4x 8 + 4x = 20 + x + -1x Combine like terms: x + -1x = 0 8 + 4x = 20 + 0 8 + 4x = 20 Add '-8' to each side of the equation. 8 + -8 + 4x = 20 + -8 Combine like terms: 8 + -8 = 0 0 + 4x = 20 + -8 4x = 20 + -8 Combine like terms: 20 + -8 = 12 4x = 12 Divide each side by '4'. x = 3 Simplifying x = 3
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