proszę wykonajcie z działaniami potrzebuje do końca dnia dzisiaj błagam
dam naj PROSZĘ

Odpowiedź:
Poziom A
a)
3x - 8 = -7
3x = -7 + 8
3x = 1 //: 3
x = 1/3
b)
4x - 2 = -2
4x = -2 + 2
4x = 0
x = 0
c)
15x + 19 = 10
15x = 10 - 19
15x = -9 //: 15
x = -9/15
x = -3/5
d)
2x + 9 = 1
2x = 1 - 9
2x = -8 //: 2
x = -4
e)
7x - 9 = 5
7x = 5 + 9
7x = 14 //: 7
x = 2
f)
8x + 5 = -7
8x = -7 - 5
8x = -12 //: 8
x = -12/8
x = -3/2
x = -1 i 1/2
g)
9x - 40 = 14
9x = 14 + 40
9x = 54 //: 9
x = 6
h)
20x + 7 = 31
20x = 31 - 7
20x = 24 //: 20
x = 24/20
x = 6/5
x = 1 i 1/5
i)
6x - 25 = -25
6x = -25 + 25
6x = 0
x = 0
Poziom B
a)
3x - 8 = 2x + 4
3x - 2x = 4 + 8
x = 12
b)
5x - 3 = 4x + 6
5x - 4x = 6 + 3
x = 9
c)
7x - 9 = 6x - 8
7x - 6x = -8 + 9
x = 1
d)
7x - 5 = 6x + 8
7x - 6x = 8 + 5
x = 13
e)
5x - 8 = 4x + 9
5x - 4x = 9 + 8
x = 17
f)
9x - 4 = 8x + 5
9x - 8x = 5 + 4
x = 9
g)
12x + 4 = 11x + 15
12x - 11x = 15 - 4
x = 11
h)
3x - 1 = 2x + 1
3x - 2x = 1 + 1
x = 2
i)
2x + 7 = x - 1
2x - x = -1 - 7
x = -8
Dalej nie wiem, ale mam nadzieję że choć trochę pomogłam :)