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9y-15=8y
9y-8y=15
y=15
y=15
4.)y-3y=1/2-4/4+9/7
-2y=14/28-28/28+36/28
-2y=22/28
y=22/28+2
y=22/28+56/28
y=78/28=39/14
maaf kalau salah