2.
(x+20)×3-10=53
(x+20)×3=63
x+20=21
x=1
3.
3x-11=6
3x=17
4.
9+2x=16
2x=7
5.
x+(x+1)+(x+2)=57
x+x+1+x+2=57
3x+3=57
3x=54
x=18
Răspuns: 18, 19, 20
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2.
(x+20)×3-10=53
(x+20)×3=63
x+20=21
x=1
3.
3x-11=6
3x=17
4.
9+2x=16
2x=7
5.
x+(x+1)+(x+2)=57
x+x+1+x+2=57
3x+3=57
3x=54
x=18
Răspuns: 18, 19, 20