6) 5(1 + 2x) - (2x - 1) = 7
5 + 10x - 2x + 1 = 7
10x - 2x = 7 - 5 - 1
8x = 1
x = 1 : 8 = 0,125
7) 11(1 - 2x) - 8(3x - 5) = 1 + 4x
11 - 22x - 24x + 40 = 1 + 4x
- 22x - 24x - 4x = 1 - 11 - 40
- 50x = - 50
x = - 50 : (- 50) = 1
<span>а2-6а-16=а2-8а+2а-16=а(а-8)+2(а-8)=(а-8)(а+2)</span>
-4х-8+3х-3-2=4х-8+9
-4х-4х+3х=9+5
-5х=14
х=-14/5