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3X+3+2(X+5)=23

7X+3(X+2)=16

11+14=3(X+1)=16

13(X-2)-2X=7

(x+4200):80=81

Răspuns :

MariaDN
3X+3+2(X+5)=23
3x+3+2x+10=23
5x+13=23
5x=23-13
5x=10
x=10÷5
x=2

7X+3(X+2)=16
7x+3x+6=16
10x=16-6
10x=10
x=10 ÷10
x=1

13(X-2)-2X=7
13x-26-2x=7
11x-26=7
11x=7+26
11x=33
x=33 ÷11
x=3

(x+4200):80=81
x+4200=80×81
x+4200=6480
x=6480-4200
x=2280




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