(x+2)+x=9x+(7+x)=11x+2x-5=40x+(4+x)=x=16

Question

(x+2)+x=9
x+(7+x)=11
x+2x-5=40
x+(4+x)=x=16

Answer 1

(x+2)+x=9
x+x=9-2
2x=7

x+(7+x)=11
x+x=11-7
2x=4
x=2
решение третего
x+2x-5=40
3x= 45
x=15
x+(4+x)=x+16
x+x-x=16-4
x=12