Odpowiedź :
a) 3x - 4 = 11 |+4
3x = 15 |:3
x = 5
b) 10 - 2x = 18 + 6x |+2x
10 = 18 + 8x |-18
-8 = 8 x |:8
x = -1
c) 7x + 25 = 3(x+7)
7x + 25 = 3x + 21 |-21
7x + 4 = 3x |-7x
4 = -4x |:-4
x = -1
Odpowiedź:
a)3−4=11
3−4+4=11+4
=5
b)10−2=18+6
−2+10=18+6
=−1
c)7+25=3(+7)
7+25=3+21
=−1