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1. 6 – а = 3∙(3а –8)
2. 0,4∙(6у –7)=0,5∙(3у + 7)
3. 18х –11 = 7
4. 8х – (2х +4) = 2∙(3х – 2)
5. 3∙(5х – 7)= 5∙(3х +4)
6. 20∙(1 – 2х) –15∙(х + 3)= 12∙ (2 – 4х
1. 6 – а = 3∙(3а –8)
2. 0,4∙(6у –7)=0,5∙(3у + 7)
3. 18х –11 = 7
4. 8х – (2х +4) = 2∙(3х – 2)
5. 3∙(5х – 7)= 5∙(3х +4)
6. 20∙(1 – 2х) –15∙(х + 3)= 12∙ (2 – 4х
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Answers & Comments
1.
6-а = 3 За - 8
6-а = 9а - 24
a - 9a = - 24 -6
- 10а = - 30
а =3
2.
0,4 •(6у -7) =0,5 •(Зу +7)
2,4 y - 2,8- 1,5у + 3,5
2,4y - 1,5y = 3,5 + 2,8
0,9y = 6,3
y = 7
3.
18х - 11 = 7
18х - 7+11 =
18 х = 18
х = 1
4.
8x - (2x+4) = 2(3х - 2
8x - 2х - 4 = 6x - 4
8x - 2x = 6x
6x = 6x
5.
3•(5x -7) = 5(3х + 4)
15x - 21 = 15х + 20
21 = 20
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