1.2(3b+5)=2 (2.4b-3.6)
3.2 (5x-1)=3.6x-9.4
-3 (2.1x-4)-4.2=1.2 (-5x+0.5)

1.2(3b+5)=2 (2.4b-3.6)1,2*3b+1,2*5=2*2,4b-2*3,63,6b+6=4,8b-7,24,8b-3,6b=6+7,21,2b=13,2b=13,2:1,2b=113.2 (5x-1)=3.6x-9.43,2*5x-3,2=3,6x-9,416x-3,6x=-9,4+3,212,4x=-6,2x=-6,2:12,4x=-0,5-3 (2.1x-4)-4.2=1.2 (-5x+0.5)-3*2,1x+3*4-4,2= -1,2*5x+1,2*0,5-6,3x+7,8=-6x+0,66,3x-6x=7,8-0,60,3x=7,2x=7,2:0,3x=24