Odpowiedź:
1.
3x-2=2x+9 =
= 6-2=4+9
1 zadanie to fałsz
2.
a) 2x= 11-5
2x= 6 | :2
x = 3
6+5 =11
b)
4x+3=2x+9
4x-2x=9-3
2x=6 |3
12+3=6+9
c)
7+8x=-5-4x
8x+4x=-5-7
12x=-12 | :12
x=-1
7-8=-5+4
d)
5y+4=3y
5y-3y=-4
2y=-4 |:2
y=-2
-10+4=-6
