1)2х+(11-4х)=21
2х+11-4х=21
-2х=21-11
-2х=10
х=10:(-2)
х=-5
2)а)7х+5х=25-13
12х=12
х=12/12
х=1
б)х+10-20х=29
-19х=29-10
-19х=19
х=19/-19
х=-1
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1)2х+(11-4х)=21
2х+11-4х=21
-2х=21-11
-2х=10
х=10:(-2)
х=-5
2)а)7х+5х=25-13
12х=12
х=12/12
х=1
б)х+10-20х=29
-19х=29-10
-19х=19
х=19/-19
х=-1