rozwiąż równania....

Odpowiedź:
[tex]a)\\\\3+7x-6=3x-1+2x\\\\-3+7x=5x-1\\\\7x-5x=-1+3\\\\2x=2\ \ |:2\\\\x=1\\\\\\b)\\\\-5x+7=11-x\\\\-5x+x=11-7\\\\-4x=4\ \ |:(-4)\\\\x=-1\\\\\\c)\\\\3,2x-2-2,1x=0,8-0,3x\\\\1,1x-2=0,8-0,3x\\\\1,1x+0,3x=0,8+2\\\\1,4x=2,8\ \ |:1,4\\\\x=2,8:1,4\\\\x=28:14\\\\x=2[/tex]
[tex]d)\\\\13x+6-x=7x-4\\\\12x+6=7x-4\\\\12x-7x=-4-6\\\\5x=-10\ \ |:5\\\\x=-2[/tex]
a)
3 + 7x - 6 = 3x - 1 + 2x
7x - 3x - 2x = (-1) + (-3) + 6
2x = 2 /: 2
x = 2/2
x = 1
b)
-5x + 7 = 11 - x
-5x + x = 11 - 7
-4x = 4 /: (-4)
x= 4/-4
x= (-1)
c)
3,2x - 2 - 2,1x = 0,8 - 0,3x
3,2x - 2,1x + 0,3x = 0,8 + 2
1,4x = 2,8 /: 1,4
x= 2,8/1,4
x= 2
d)
13x + 6 - x = 7x - 4
13x - x - 7x = (-4) + (-6)
5x = (-10) /:5
x= -10/5
x= (-2)