Odpowiedź:
1) 7x + 2x - 5x = 4 - 18 + 2
4x = -12
x = -3
2) 0,6x = 1,5 - 2,8 - 1,7
0,6x = -3
x = -5
3) [tex]\frac{5}{6}[/tex]x + [tex]\frac{8}{9}[/tex] = 4 - [tex]\frac{1}{3}[/tex]x |×18
15x + 16 = 72 - 6x
15x + 6x = 72 - 16
21x = 56
x = [tex]\frac{56}{21}[/tex] = 2[tex]\frac{2}{3}[/tex]
4) 3x - 15 - 12x - 20 = 1
-9x = 36
x = -4
5) [tex]\frac{6x-3}{3}[/tex] + [tex]\frac{6-12x}{6}[/tex] = 1
3x - 1 + 1 - 2x = 1
x = 1
6) [tex]\frac{3x-7}{8}[/tex] - [tex]\frac{5x-4}{4}[/tex] = 3
[tex]\frac{3x-7}{8}[/tex] - [tex]\frac{10x-8}{8}[/tex] = 3
[tex]\frac{3x-7-10x+8}{8}[/tex] = 3
[tex]\frac{-7x+1}{8}[/tex] = 3
-7x + 1 = 24
-7x = 23
x = - [tex]\frac{23}{7}[/tex] = -3[tex]\frac{2}{7}[/tex]
