Question

Rozwiąż po kolei te równania:
2x + 15 = 3x - 6
x - 1 = 2x + 21
3x + 4 = 4 - 2x
2x + 7 = 5x + 1
11 - x = 3x - 8
24 - 3x = 15 + 2x

Answer 1

2x + 15 = 3x - 6
2x-3x = -6-15
-x = -21 |*(-1)
x = 21


x - 1 = 2x + 21
x-2x = 21-1
-x = 20 |*(-1)
x = -20


3x + 4 = 4 - 2x
3x+2x = 4-4
5x = 0 |:5
x = 0


2x + 7 = 5x + 1
2x-5x = 1-7
-3x = -6 |:(-3)
x = 2


11 - x = 3x - 8
-x-3x = -8-11
-4x = -19 |:(-4)
x = 19/4 = 4 i 3/4


24 - 3x = 15 + 2x
-3x-2x = 15-24
-5x = -9 |:(-5)
x = 9/5 = 1 i 4/5