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zad.6
a)
[tex] \frac{x}{5} + 8 = 20 \\ x + 40 = 100 \\ x = 100 - 40 \\ x = 60[/tex]
b)
[tex]3 + \frac{x}{3} = 4 \\ 9 + x = 12 \\ x = 12 - 9 \\ \times = 3[/tex]
zad.7
a)
[tex]3(x - 5) = 9 \\ 3x - 15 = 9 \\ 3x = 9 + 15 \\ 3x = 24 \\ x = 8[/tex]
b)
[tex]4(x + 1) = - 8 \\ 4x + 4 = - 8 \\ 4x = - 8 - 4 \\ 4x = - 12 \\ x = - 3[/tex]
zad8
a)
[tex]2x + 5 + x - 2 = 12 \\ 2x + x = 12 - 5 + 2 \\ 3x = 9 \\ x = 3[/tex]
b)
[tex] - 3x - 1 + 5x + 7 = 0 \\ - 3x + 5x = 0 + 1 - 7 \\ 2x = - 6 \\ x = - 3[/tex]
zad9
a)
[tex]6x + 4 = 2x \\ 6x - 2x = - 4 \\ 4x = - 4 \\ x = - 1[/tex]
b)
[tex]3x - 4 = 5x \\ 3x - 5x = 4 \\ - 2x = 4 \\ x = - 2[/tex]
c)
[tex] - 2x + 7 = 6x - 9 \\ - 2x - 6x = - 9 - 7 \\ - 8x = - 16 \\ x = 2[/tex]
d)
[tex] - 2x = 7x + 18 \\ - 2x - 7x = 18 \\ - 9x = 18 \\ x = - 2[/tex]
e)
[tex] - 4x + 5 = 25 - 9x \\ - 4x + 9x = 25 - 5 \\ 5x = 20 \\ x = 4[/tex]