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3x + 2x = 20 - 5
5x = 15
x = 3
Jika,
x + 3 = ....
3 + 3 = 6
3x + 2x = 20 + 5
5x = 25
x = 25 : 5
= 5
jadi : 5 + 3 = 8
maaf kalo salah ya