Don’t know how to solve system of equations 1=a+b+c (-C)=a- (1/2)b+(1/4)c (-D)=a-2b+4c Solve for

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Don't know how to solve system of equations

1=a+b+c

(-C)=a- (1/2)b+(1/4)c

(-D)=a-2b+4c

Solve for a, b, and c in terms of C and D (which are constants)