Ответ:
1. 10-7+4x+x=9x-9
10-7+5x=9x-9
5x-9x=-9-10+7
4x=-12
x=-3
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Ответ:
1. 10-7+4x+x=9x-9
10-7+5x=9x-9
5x-9x=-9-10+7
4x=-12
x=-3