3х - 21 + 4 = 7х - 1
7х - 3х = - 17 + 1
4х = - 16
х = - 4
Ответ : - 4
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3х-21+4=7х-1
3х-7х=-1+21-4
-4х=16
х=-4
3х - 21 + 4 = 7х - 1
7х - 3х = - 17 + 1
4х = - 16
х = - 4
Ответ : - 4