1) 7 + x = 5
x = 5 - 7
x = -2
2) 3x - 8 = 19
3x = 19 + 8
3x = 27 / : 3
x = 9
3) 2x - 3 = 8 - x
2x + x = 8 + 3
3x = 11 / : 3
[tex]x = \frac{11}{3} = 3\frac{2}{3}[/tex]
4) (8 - 2x) : 2 = 10
[tex]\frac{8-2x}{2} = 10 \ \ \ \ \ \ / * 2[/tex]
8 - 2x = 20
-2x = 12 / : (-2)
x = -6
5) -2(x + 1) = 3(x - 4)
-2x - 2 = 3x - 12
-2x - 3x = -12 + 2
-5x = -10 / : (-5)
x = 2
Mam nadzieję, że pomogłam ;)
Pozdrawiam
