Answer:
[tex]\huge\boxed{8x-21}[/tex]
Step-by-step explanation:
[tex]7(x-1)-2(x+1)+3(x-4)\qquad|\text{use the distributive property}\\\\=(7)(x)+(7)(-1)+(-2)(x)+(-2)(1)+(3)(x)+(3)(-4)\\\\=7x-7-2x-2+3x-12\qquad|\text{combine like terms}\\\\=(7x-2x+3x)+(-7-2-12)\\\\=8x-21[/tex]
