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[tex] \: \: \: \: \: \: [/tex]

# 2a+b+c=9

answer

[tex]a = \frac{9}{2} - \frac{1}{2} b - \frac{1}{2} c[/tex]

#a+2b+c=8

answer

[tex]a = 8 - 2b - c[/tex]

#a+b+2c=11

answer

[tex]a = 11 - b - 2c[/tex]

refer to the attachment for explanation

hope it helps

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