Odpowiedź:
a)
4x + 15 = -5 |-15
4x = -20 |:4
x = -5
b)
2x + 7 = 4x - 3
2x - 4x = -3 - 7
-2x = -10 |:(-2)
x = 5
c)
-2(x+3) + 4(2x+3)=-6
-2x-6+8x+12 = -6
6x + 6 = -6 |-6
6x = -12 |:6
x = -2
d)
x - (7 + 2x) = 2(x-1) + 1
x - 7 - 2x = 2x - 2 + 1
-x - 7 = 2x - 1
-x - 2x = -1 + 7
-3x = 6 |:(-3)
x = -2
e)
[tex]\frac{x}{2}-\frac{3}{4}=\frac{7}{8}+\frac{x}{4}[/tex] |*8
4x - 6 = 7 + 2x
4x - 2x = 7 +6
2x = 13 |:2
x = 6,5
f)
[tex]\frac{x+5}{3}-5=x-2[/tex] |*3
x+5 - 15 = 3x - 6
x - 10 = 3x -6
x - 3x = -6+10
-2x = 4 |:(-2)
x = -2
g)
[tex]\frac{x+4}{5}+\frac{2x+9}{10}=\frac{-2-x}{2}[/tex] |*10
2(x + 4) + 2x + 9 = 5 (-2 - x)
2x + 8 + 2x + 9 = -10 -5x
4x + 17 = -10 - 5x
4x + 5x = -10 - 17
9x = -27 |:9
x = -3
Szczegółowe wyjaśnienie:
