2(4-5x)-3 = 15
8-10x-3 = 15
-10x-3 = 15-8
-10x = 7+3
-10x = 10 /: (-10)
x = -1
sprawdzenie:
2*(4-5*(-1))-3 = 2*(4-(-5))-3 = 2*9-3 = 18 - 3 = 15
Odpowiedź:
2(4 - 5x ) - 3 = 15
8 - 10x - 3 = 15 / -3
8 - 10x = 12 / - 8
- 10x = 4 / : -10
x = - 4/10 = - 2/5
x = - 2/5
