3х-21-9+2х=24-2х-х+10
3х+2х+2х+х=24+10+9+21
8х=64
х=64/8
х=8
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3х-21-9+2х=24-2х-х+10
3х+2х+2х+х=24+10+9+21
8х=64
х=64/8
х=8