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-3x-2x=-62-8
-5x=-70 /;(-5)
x=14
b) 4(x-3)-3(2x-4)=2(x-5)
4x-12-6x+12=2x-10
4x-6x-2x=-10+12-12
-4x=-10 /:(-4)
x=2,5
c) 3(2x-1)-(x+5)=4(x-2)+(x+2)
6x-3-x-5=4x-8+x+2
6x-x-4x-x=-8+2+3+5
0≠2
d) (x+1)(x+4)=x(x+7)
x²+4x+x+4=x²+7x
x²+4x+x-x²-7x=-4
-2x=-4 /:(-2)
x=2
e) (x+1)²+2x=(x-3)(x+3)-2
x²+2x+1+2x=x²-9-2
x²+2x+2x-x²=-9-2-1
4x=-12 /:4
x=-3
zad.2
a) 3(x-2)-2(x-4) < 4(x+5)
3x-6-2x+8 < 4x+20
3x-2x-4x <20+6-8
-3x < 18 /:(-3)
x > -6
b) 4-[2x-3(x-2)+5] > 1-[3-(2-5x)]
4-[2x-3x+6+5] > 1-[3-2+5x]
4-2x+3x-6-5 > 1-3+2-5x
-2x+3x+5x > 1-3+2-4+6+5
6x > 7 /:6
x > 7/6
x> 1 1/6
c) (x-2)²-(x+3)² < 5
x²-4x+4-(x²+6x+9) < 5
x²-4x+4-x²-6x-9 < 5
x²-x²-4x-6x < 5-4+9
-10x < 10 /:(-10)
x > -1