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Simplifying 4x + 4[2x + -7] = 80 Reorder the terms: 4x + 4[-7 + 2x] = 80 4x + [-7 * 4 + 2x * 4] = 80 4x + [-28 + 8x] = 80 Reorder the terms: -28 + 4x + 8x = 80 Combine like terms: 4x + 8x = 12x -28 + 12x = 80 Solving -28 + 12x = 80 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '28' to each side of the equation. -28 + 28 + 12x = 80 + 28 Combine like terms: -28 + 28 = 0 0 + 12x = 80 + 28 12x = 80 + 28 Combine like terms: 80 + 28 = 108 12x = 108 Divide each side by '12'. x = 9 Simplifying x = 9
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