a) ( x-34) x 15=0
( x-34) =0 : 15
( x-34) =0
x =0 + 34
x =34
b) 18 x ( x-16)=18
( x- 16)=18 : 18
( x-16) =1
x = 16 + 1
x = 17
c) ( x-4).( x-3)=0
x . ( 4-3) =0
x . 0 =0 ( n* . o = 0 )
=> x = n*
e) 6.x + 4.x=2020
10.x =2020
x =2020:10
x =202