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5a+b+c=-26
kurangkan
-4a-2b=24
atau
-2a-b=12
5a+b+c=-26
-2a+c=-4
kurangkan
7a+b=-22
-2a-b=12
7a+b=-22
tambahkan
5a=-10
a=-2
7(-2)+b=-22
b=-22+14
b=-8
-2a+c=-4
-2(-2)+c=-4
c=-4-4
c=-8