5,6z-2z-0,7z+2,65=7
5.6z-2z-0.7z+2.65=7
переносим 2,65
2,9z=7-2.65
2.9z=4.35
z=4.35:2,9
z=1.5
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5.6z-2z-0.7z+2.65=7
переносим 2,65
2,9z=7-2.65
2.9z=4.35
z=4.35:2,9
z=1.5