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semuanya dikali 10
jadinya
5(x-4) = 40 + 8x
5x - 20 = 40 + 8x
-20 -40 = 8x - 5x
-60 = 3x
-60:3 = x
-20 = x
10(1/2(x-4))= 10 ( 4 + 4/5 x ) ⇒ruas kanan dan kiri sama sama dikali 10
5( x - 4 ) = 40 + 8x
5x - 20 = 40 + 8x
5x - 8x = 40 + 20
- 3x = 60
x = 60/-3
x= -20