Potrzebuje na już zadanie 12 z strony 195 wszystkie podpunkty (a,b,c,d,e,f,g,h).Daje naj

Odpowiedź:
a) 2x + 6 = 5 + 3x
2x - 3x = 5 - 6
-x = -1
x=1
b) 2x - 3 = 2 + 4x
2x - 4x = 2 + 3
-2x = 5
x= -2[tex]\frac{1}{2}[/tex]
c)x + 2 + 3(x - 1) = 9
x + 2 + 3x - 3 = 9
4x - 1 = 9
4x = 9 +1
4x = 10
x = 2[tex]\frac{1}{2}[/tex]
d) 3(2x + 3) = 5(2 - x) + 15x
6x + 9 = 10 - 5x + 15x
6x + 9 = 10 + 10x
6x - 10x + 10 - 9
-4x = 1
x = - 1/4
e) 5(3x - 5) - (5x - 1) = 0
15x - 25 - 5x + 1 = 0
10x - 24 = 0
10x = 24
x= 2[tex]\frac{2}{5}[/tex]
f) x/2 = 8/5 - 2/5x - 4
x/2 = -12/5 - 2/5x
5x = -24 - 4x
5x + 4x = -24
9x = -24
x = - 2[tex]\frac{2}{3}[/tex]
g) [tex]\frac{2x-1}{5}[/tex] - [tex]\frac{x-2}{2}[/tex] = [tex]\frac{7}{10} x[/tex]
2(2x - 1) - 5(x - 2) = 7x
4x - 2 -5x + 10 =7x
-x + 8 = 7x
-x - 7x = -8
-8x = -8
x = 1
h) 8x - (3x + 5) = -x - 4
8x - 3x - 5 = -x - 4
5x - 5 = -x - 4
5x + x = -4 + 5
6x = 1
x= 1/6