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-1=4a+b => b=-4a-1
2a-4=-4a-1
6a=3 => a=1/2
b=-2-1=-3
b) 6=-8a+b =>b=6+8a
4=-3a+b => b=4+3a
6+8a=4+3a
5a=-2 => a=-2/5
b=4-6/5= 14/5