Question

1)3(x-2)=x+2
2)5-2(x-1)=4-x
3)(7x+1)-(9x+3)=5
4)3,4+2y=7(y-2,3)
5)0,2(7-2y)=2,3-0,3(y-6)
6)2/3(1/3x-1/2)=4x+2 1/2

Answer 1

1) 4

2) 3

3) -3.5

4) 3.9

5) -27

6) -0.75

Answer 2

1

$3( x - 2) = x + 2 \\ 3x - 6 = x + 2 \\ 3x - x = 2 + 6 \\ 2x = 8 \\ x = 4$

2

$5 - 2(x - 1) = 4 - x \\ 5 - 2x + 2 = 4 - x \\ 7 - 2x = 4 - x \\ - 2x + x = 4 - 7 \\ - x = - 3 \\ x = 3$

3

$(7x + 1) - (9x + 3) = 5 \\ 7x + 1 - 9x - 3 = 5 \\ - 2x - 2 = 5 \\ - 2x = 5 + 2 \\ - 2x = 7 \\ x = - \frac{7}{2} = - 3.5$

4

$3.4 + 2y = 7(y - 2.3) \\ 3.4 + 2y = 7y - 16.1 \\ 2y - 7y = - 16.1 - 3.4 \\ - 5y = - 19.5 \\ y = 3.9$

5

$0.2(7 - 2y) = 2.3 - 0.3(y - 6) \\ 1.4 - 0.4y = 2.3 - 0.3y + 1.8 \\ 1.4 - 0.4y = 4.1 - 0.3y \\ - 0.4y + 0.3y = 4.1 - 1.4 \\ - 0.1 = 2.7 \\ y = - 27$

6

2/3*(1/3 х -1/2)=4х+2 1/2

2/9 х - 1/3 = 4х + 5/2

4х-6=72х+45

4х-72х=45+6

-68х=51

х=-3/4=-0.75