Упростите выражение ( 9,3b-1,5b):(-6) при b ровно 4, и -5

5(y+1,2)=12,5y

5y+6-12.5y=0

-7.5y+6=0

y=6/7.5

y=0.8

<span>4(3-2х)+24=2(3+2х)</span>

<span>36-8x-6-4x=0</span>

<span>30-12x=0</span>

x=30/12

x=2.5

<span>0,2(5у-2)=0,3(2у-1)-0,9</span>

<span>y-0.4-0.6y+0.3+0.9=0</span>

<span>0.4y+0.8=0</span>

y=-0.8/0.4

y=-2