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5x-9x = 15-3
-4x= 12
x = 12/-4
x = -3
mka : x + 6 = -3 + 6 = 3
5x-9x=15-3
-4x=12
x=12/-4
x=-3
disubtitusikan
x+6=-3+6 =3
jadi hasilnya 3
maaf kalau kurang tepat