(20 - 3х) - (4 - 7х) = 4
20 - 3х - 4 + 7х = 4
7х - 3х = 4 + 4 - 20
4х = -12
х = -12 : 4
х = -3
Ответ: при х = -3.
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(20 - 3х) - (4 - 7х) = 4
20 - 3х - 4 + 7х = 4
7х - 3х = 4 + 4 - 20
4х = -12
х = -12 : 4
х = -3
Ответ: при х = -3.