Simplify the expression: 12(4x+8)−3(x−1)\frac{1}{2}(4x + 8) - 3(x - 1)21(4x+8)−3(x−1).
−x+7-x + 7−x+7
x+7x + 7x+7
−x+1-x + 1−x+1
x+1x + 1x+1