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20x-5=35
30x+15=375
12x-125=138
453+6x=531
1251+101x=2160
431x-2031=8744
221x+721=2931

72-2x=36
81-3x=27
3-15x=3
51=35x-19

Răspuns :

Renatemambouko
20x-5=35
20x=40
x=2

30x+15=375
30x=360
x=12

12x-125=138
12x=263
x=263/12

453+6x=531
6x=78
x=13

1251+101x=2160
101x=909
x=9

431x-2031=8744
431x=10775
x=25

221x+721=2931
221x=2210
x=10

72-2x=36
2x=36
x=18

81-3x=27
3x=54
x=18

3-15x=3
15x=0
x=0

51=35x-19 35x=70
x=2

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