Решите уравнение 1)9-7(х+3)=5-6х 2)(4х-15)(5х+35)(0,75-0,2х)=0 3)х+3/9+2х-1/6=х+1/2-х+7/18

1) 9-7x+21=5-6x
-7x+6x=5-9-21
-x=-25
x=25
2) (4*3.75)(5*(-7)+35)(0.75-0.2*3.75)=0


3x=8/9-1/2
3x= 16/18-9/18
3x= 7/18
x= 7/18*1/3
x=1/54