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денис20043
@денис20043
July 2022
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а) 3а + 5 = 8а – 15
б) 4,72 – 2,5х = 2х + 2,92
в) 6х – 4 = 20
г) 4х + 18 = 2х
д) 20 – 5х = 8х – 6
е) 4,37 + 6,7х = 7,75 + 9,3х
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Synco
а) 3а+5=8а–15
3a-8a=-15-5
-5a=-20
a=4
б) 4,72–2,5х =2х+2,92
-2,5x-2x=2,92-4,72
-4,5x=-1,8
x=0,4
в) 6х–4=20
6x=20+4
6x=24
x=4
г) 4х+18=2х
4x-2x=-18
2x=-18
x=-9
д) 20–5х=8х–6
-5x-8x=-6-20
-13x=-26
x=2
е) 4,37+6,7х=7,75+9,3х
6,7x-9,3x=7,75-4,37
-2,6x=3,38
x=-1,3
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Answers & Comments
3a-8a=-15-5
-5a=-20
a=4
б) 4,72–2,5х =2х+2,92
-2,5x-2x=2,92-4,72
-4,5x=-1,8
x=0,4
в) 6х–4=20
6x=20+4
6x=24
x=4
г) 4х+18=2х
4x-2x=-18
2x=-18
x=-9
д) 20–5х=8х–6
-5x-8x=-6-20
-13x=-26
x=2
е) 4,37+6,7х=7,75+9,3х
6,7x-9,3x=7,75-4,37
-2,6x=3,38
x=-1,3