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b=-6-c
a+2b+2c-d=6
4+3d+2(-6-c)+2c-d=6
4+3d-12-2c+2c-d=6
2d=6+8
d=14/2=7
a= 4+3.7=4+21=25
a+b+c+d= 25 + (-6)+7=26