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zheleznovamashenka18
@zheleznovamashenka18
August 2022
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siksnx
1) 7х+10=5х+2
7х-5х=-10+2
2х=-8
х=-4
2) 4(3х-2)+5=9
12х-8+5=9
12х-3=9
12х=9+3
12х=12
х=1
3) 2х-5=7(3х+4)+5
2х-5=21х+28+5
2х-5=21х+33
2х-21х=5+33
-19х=38
=-2
4) 28-4(3х+2)=5(2х-7)
28-12х-8=10х-35
20-12х=10х-35
20+35=12х+10х
55=22х
х=55/22
х=5/2
х= 2 целых 1/2
5) 3х-4(5х+2)-6(3х-4)=1
3х-20х-8-18х+24=1
-35х+16=1
-35х=-15
х=-15/-35
х=-3/-7
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Answers & Comments
7х-5х=-10+2
2х=-8
х=-4
2) 4(3х-2)+5=9
12х-8+5=9
12х-3=9
12х=9+3
12х=12
х=1
3) 2х-5=7(3х+4)+5
2х-5=21х+28+5
2х-5=21х+33
2х-21х=5+33
-19х=38
=-2
4) 28-4(3х+2)=5(2х-7)
28-12х-8=10х-35
20-12х=10х-35
20+35=12х+10х
55=22х
х=55/22
х=5/2
х= 2 целых 1/2
5) 3х-4(5х+2)-6(3х-4)=1
3х-20х-8-18х+24=1
-35х+16=1
-35х=-15
х=-15/-35
х=-3/-7