Ответ:
3. 7x-15=4x-3(x-3)
7x-15=4x-3x+9
7x-15=x+9
7x-x=9+15
6x=24
x=4
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Ответ:
3. 7x-15=4x-3(x-3)
7x-15=4x-3x+9
7x-15=x+9
7x-x=9+15
6x=24
x=4