Ответ:
0,7x+3=0,3x-9
0,7х-0,3х=-3-9
0,4х=-12
х=-30
x-2=5/7x+2 ×7
7х-14=5х+14
7х-5х=14+14
2х=28
х=14
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Ответ:
0,7x+3=0,3x-9
0,7х-0,3х=-3-9
0,4х=-12
х=-30
x-2=5/7x+2 ×7
7х-14=5х+14
7х-5х=14+14
2х=28
х=14