x+2+x=9
2x=9-2
2x=7
x= 3,5
x+x+4+x=16
3x=16-4
3x=12
x=4
2x-16=20
2x=20+16
2x= 36
x= 18
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Verified answer
x+2+x=9
2x=9-2
2x=7
x= 3,5
x+x+4+x=16
3x=16-4
3x=12
x=4
2x-16=20
2x=20+16
2x= 36
x= 18
2х+2=9
2х=9-2
2х=7
х=3.5
2) х+х+4+х=16
3х+4=16
3х=12
х=4
3) 2х-16=20
2х=16+20
2х=36
х=18