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6x-2x = 9+2
4x = 11
x = 11/4
karena x ∈ Z sedangkan 11/4 ∉ Z, maka tidak ada x yang memenuhi
mungkin soalnya spt ini:
6x-3 = 2x+9
6x-2x = 9+3
4x = 12
x = 12/4
x = 3 ---> x=3 ∈ Z
x-5 = 3-5
= -2