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Simplifying 4x + -1(x + 4) = 20 Reorder the terms: 4x + -1(4 + x) = 20 4x + (4 * -1 + x * -1) = 20 4x + (-4 + -1x) = 20 Reorder the terms: -4 + 4x + -1x = 20 Combine like terms: 4x + -1x = 3x -4 + 3x = 20 Solving -4 + 3x = 20 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + 3x = 20 + 4 Combine like terms: -4 + 4 = 0 0 + 3x = 20 + 4 3x = 20 + 4 Combine like terms: 20 + 4 = 24 3x = 24 Divide each side by '3'. x = 8 Simplifying x = 8
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