sederhanakan aljabar tolong ya pakai caranya a.18x-5(x-3y) b.12=2(4x-3) c.a(a=3b)=2a(4a=5b)

a] 18x - 5 ( x - 3y )
= 18x - 5x + 15y
= 13x + 15y

b] 12 = 2 ( 4x - 3 )
12 = 8x - 6
12 + 6 = 8x
18 = 8x

c] a ( a = 3b ) = 2a ( 4a = 5b )
( a^2 = 3ab ) = ( 8a^2 = 10ab )
( 8a^2 - a^2 ) = ( 10ab - 3ab )
7a^2 = 7ab
----------------- :7
a^2 = ab

semoga membantu ^_^