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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 = -28 4x = -28 Divide each side by '4'. x = -7 Simplifying x = -7
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