Объяснение:
5х-7х=2+20
-2х=22
х=22:(-2)
х=-11
-х-3х=-9+20
-4х=11
х=11:(-4)
х=-2 3/4
11х-6х=-7-19
5х=-26
х=-26:5
х=-5,2
-х-7х=-16-3
-8х=-19
х=-19:(-8)
х=2 3/8
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Объяснение:
5х-7х=2+20
-2х=22
х=22:(-2)
х=-11
-х-3х=-9+20
-4х=11
х=11:(-4)
х=-2 3/4
11х-6х=-7-19
5х=-26
х=-26:5
х=-5,2
-х-7х=-16-3
-8х=-19
х=-19:(-8)
х=2 3/8