rozwiązywanie równań (zdj)

Odpowiedź:
a) x + 7 = 13
x = 6
b) 2x + 13 = 15
2x = 2
x = 1
c) 3x - 11 = 25
3x = 36
x = 12
d) 2(x + 3) = 10
2x + 6 = 10
2x = 4
x = 2
e) 2 (13 - x) -9 = 1
26 - 2x - 9 = 1
2x = 1 + 9 - 26
2x = -16
x = -8
f) 2(3x - 4) = 10x
6x - 8 = 10x
-4x = 8
x = -2
g) 2x - 4 - 3(2 - x) = 5(2x - 1)
2x - 4 - 6 + 3x = 10x - 5
-5x = 5
x = -1
h) 2/3y - 1/6 = 3
4y - 1 = 18
4y = 19
y = 19/4
j) 5x - 0,8 = 0,1 + 2x
3x = 0,9
x = 0,3