-3 (2,1z-4)-4,2=1,2 (-5z+0,5)

Question

-3 (2,1z-4)-4,2=1,2 (-5z+0,5)

Answer 1

Раскрываем скобки
-6,3z + 12 - 4.2= -6z+0.6
-6.3z+6z=0.6-12+4.2
-0.3z=-7.2
z=-7.2:-0.3
z=24