dau 40 puncte na rog e urgent

1 a) 9x-27-28+12x=5-3x
9x+12x+3x=5+27+28
24x=60
x=[tex]\frac{24}{60}[/tex]
b) |x-1|=2
x-1=2 => x=3
SAU
x-1=-2 => x=-1