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Simplifying 12x + -1(20 + 8x) = 100 12x + (20 * -1 + 8x * -1) = 100 12x + (-20 + -8x) = 100 Reorder the terms: -20 + 12x + -8x = 100 Combine like terms: 12x + -8x = 4x -20 + 4x = 100 Solving -20 + 4x = 100 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + 4x = 100 + 20 Combine like terms: -20 + 20 = 0 0 + 4x = 100 + 20 4x = 100 + 20 Combine like terms: 100 + 20 = 120 4x = 120 Divide each side by '4'. x = 30 Simplifying x = 30
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