Odpowiedź:
a) x = 40
b) y = 42
c) x = 4,25
d) x = 4
e) x = 0
Szczegółowe wyjaśnienie:
a)
0,1x + 7 = 11 | -7
0,1x = 4 | /0,1
x = 40
b)
1/3y + 4 = 18 | -4
1/3y = 14 | *3
y = 42
c)
5x - 3 - x = 14
4x - 3 = 14 | +3
4x = 17 | /4
x = 4,25
d)
5x - 3 + 2x = 4x + 9
7x - 3 = 4x + 9 | +3
7x = 4x + 12 | -4x
3x = 12 | /3
x = 4
e)
8x - 6 - 9x = 5x - 6
-x - 6 = 5x - 6 | +x
-6 = 6x - 6 | +6
0 = 6x
x = 0