Cześć!
a) 4x-6=x+9
4x-x=9+6
3x=15
x=5
b) 4x-9=3(2+3x)
4x-9=6+9x
4x-9x=6+9
-5x=15
x=-3
c) 2x-5(x+2)=4x-(-3+x)
2x-5x-10=4x+3-x
2x-5x+x-4x=3+10
-6x=13
x=-13/6
x=-2 1/6
d) 2(2x+1)+(3+x)=5x+7
4x+2+3+x=5x+7
4x-5x=7-2-3
-x=2
x=-2
e)
[tex] \frac{4x - 2}{3} = \frac{3x - 5}{4} \\ 12 \times \frac{4x - 2}{3} = 12 \times \frac{3x - 5}{4} \\ 4(4x - 2) = 3(3x - 5) \\ 16x - 8 = 9x - 15 \\ 16x - 9x = - 15 + 8 \\ 7x = - 7 \\ x = - 1[/tex]
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