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2a =5-3
2a:2 =2:2
a =1
2.3a-2=-a+8
3a+a=8+2
4a:4 =10:4
a =2,5
3.2a-1=3a-5
2a-3a=-5+1
-a.-1 =-4.-1
a =4
tanda titik adalah tanda kali (x)
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