1. 2х+13=22+3х
2. 3х-(10-9х)=22х
3. 21х+45=15+14х
4. 13х+40=2х+7
5. 25-(7-2х)=5х
6. 5-3х=2х-8

помогите, пожалуйста! Мне главное подробное объяснение, а не ответы!
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