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=7a-12a=-16-9
-5a=-25
a=5
7(5)+9=12(5)-16
35+9=60-16
n=44
>>>(44)-8=36
semoga membantu
7a - 12a = -16 -9
-5a = -25
a = -25/-5
a = 5
7a + 9 = 12a - 16
7(5) + 9 = 12(5) -16
35+ 9 = 60 - 16
44 = 44
jadi n = 44
maka n - 8 = 44 - 8 = 36