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5x = 15 + 5
5x = 20
x = 20 / 5
= 4
2. 9 - 2x = 1
-2x = 1 - 9
-2x = -8 (min dihilangkan aja gpp)
x = 8 / 2
= 4
-2x= 1-9
-2x= -8
x= -8/2
= -4