Odpowiedź :
a) 4a + 15 = -5
4a = -5 -15
4a = -20
a = -5
b) 2x - 7 = 4x + 3
2x - 4x = 7 + 3
-2x = 10
-x = 5
c) x + 2(3x - 4) = 53 + 2x
x + 6x - 8 = 53 + 2x
x + 6x - 2x = 53 + 8
5x = 61
x = 12,2
a) 4a + 15 = -5
4a = -5 -15
4a = -20
a = -5
b) 2x - 7 = 4x + 3
2x - 4x = 7 + 3
-2x = 10
-x = 5
c) x + 2(3x - 4) = 53 + 2x
x + 6x - 8 = 53 + 2x
x + 6x - 2x = 53 + 8
5x = 61
x = 12,2