3(7x-3,5)=7
21x-10,5=7
21x = 17,5
x = 0,83
21x- 10,5=7
21x=7+10,5
21x= 17,5
x= 17 1/2 :21
x= 33/42
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3(7x-3,5)=7
21x-10,5=7
21x = 17,5
x = 0,83
3(7x-3,5)=7
21x- 10,5=7
21x=7+10,5
21x= 17,5
x= 17 1/2 :21
x= 33/42