Ответ:
4-0,5x-4.5=-2.1
-0.5х=-2.1-4+4,5
-0.5х=-1,6
x=3.2
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Ответ:
4-0,5x-4.5=-2.1
-0.5х=-2.1-4+4,5
-0.5х=-1,6
x=3.2