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a+b=86
a-b=12 ( a dieliminasi)
2b=74
b=37
a+b=86 ( b disubstitusi)
a+37=86
a=86-37
a=49
hasil kali
a*b
=49*37=…………(hitung sndiri)
74×2=148
kalau salah maafin saya cuma bantu jawab