Odpowiedź :
1)
14x - 12 = 30
14x = 30 + 12
14x = 42 | : 14
x = 3
2)
8x - 6 = 9 + 3x
8x - 3x = 9 + 6
5x = 15 | : 5
x = 3
3)
2 - (9x + 6) + 2(x + 2) = 14
2 - 9x - 6 + 2x + 4 = 14
-9x + 2x = 14 - 2 + 6 - 4
-7x = 14 | : (-7)
x = -2
4)
3x - (4 - 5x) + 8 = 6(3x + 2) + (2x + 4)
3x - 4 + 5x + 8 = 18x + 12 + 2x + 4
8x + 4 = 20x + 16
8x - 20x = 16 - 4
-12x = 12 | : (-12)
x = -1
14x-12=30
14x=30+12
14x=42 /:14
x=3
8x-6=9+3x
8x-3x=6+9
5x=15 /:5
x=3
2-(9x+6)+2(x+2)=14
2-9x-6+2x+4=14
-9x+2x= -2+6-4+14
-7x=14 / :(-7)
x= -2
3x-(4-5x)+8=6(3x+2)+(2x+4)
3x-4+5x+8=18x+12+2x+4
3x+5x-18x-2x=4-8+12+4
-12x=12 /:(-12)
x= -1
mam nadzieję że pomogłam <3