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nomer 2 : 10*15=150+a hasilnya a=0
nomer 3 : 96a-72 = 80-4 -> 76+72 =96a
a= 148:96
150a = 150
a = 1
2. sama
150+25a=150
25a=0
a= 0
3. sama
96a+72=80a-40
96a-80a=-40-72
16a= -112
a= -7