Question

a=x+4,b=9-x,c=x. if 2a -b-3c = ?

Answer 1

a= x+4, b=9-x, c=x

2×(x+4)-(9-x)-3×(x)
= 2x+8 -9+x-3x
= 2x -1 -x
= x - 1. answer

Hope you had got it....

Answer 2

2a-b-3c

a=x+4,b=9-x,c=x

2(x+4)-(9-x)-3(x)
2x+8-9+x-3x
2x-2x-1
x-1