Odpowiedź:
a)
4x - 3(3x -5) = 6x + 4
4x - 9x + 15 = 6x + 4
4x - 9x - 6x = 4 - 15
-11x = -11
x = 1
b)
8 - (4x -12) = 8x - (3x -2)
8 - 4x + 12 = 8x - 3x + 2
-4x - 8x + 3x = 2 - 8 - 12
-9x = -18
x = 2
c)
[tex]\frac{5}{4}(1-x)-\frac{1}{4} =\frac{3}{4}(x-4)+3[/tex] /*4
[tex]5(1-x)-1=3(x-4)+12[/tex]
[tex]5-5x-1=3x-12+12[/tex]
[tex]-5x-3x=-12+12-5+1[/tex]
[tex]-8x=-4[/tex]
[tex]x=0,5[/tex]
d)
7(x + 2) - x = 5(x - 2)
7x + 14 - x = 5x - 10
7x - x - 5x = -10 - 14
x = -24
