tolong dijawab. 8-4x=x+20, x=....

-4x-x=20-8
-5x=12
X=12:(-5)
X=-2,4

8–4x=x+20
–4x–x=20–8
–5x=12
x=12/–5

pembuktian:
–5x=12
–5(12/–5)=12
–60/–5 =12
12=12 (terbukti)
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