3,5x(4-x)-2(x-1,5)-0,5(x-6)=4(x-1)
3,5x (4-x)-2 (x-1,5)-0,5 (x-6)=4 (x-1) 14x-3,5x-2x+3-0,5x+3=4x-4 8x-4x=-4-3-3 4x=-10:4 x=-2,5