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3y-15+2=y+7
3y-y=7+15-2
2y=20
y=10
b) gak tulis soalnya(langsung kali silang)
15x+10=16x-12
10+12=16x-15x
22=x
3y+y= 7 + (-13)
4y.1/4=-20.1/4
y=-5
b.-5