1.
4x-5y-1=0
7x-y+6=0
y=7x+6
4x-5(7x+6)-1=0
4x-35x-30-1=0
31x+31=0
x=-1
y=-7+6=-1
y=-1
2.
a5:a6=1/a
a7:a6=a
a4:a=a3
a12:a12=1
3. a2-b2/a+b=a-b
x-1/x2-1=1/x+1
m2-n2/2m+2n=m-n/2
xm+xn/m2-n2=x/m-n
4. a+1/7x*2x/a+1=2/7
2m/m-n:3m/m-n=2/3n
5. 1/a+2/a=1+2/a=3/a
6. 2x-x-1<2
x-1<2
x=(-∞;2)
7.
√3x-1=0
3x-1=0
x=1/3
8.
3x2-4x-4=0
D=16-4*3*(-4)=16-(-48)=64
x1=4-8/6=-2/3
x2=12/6=2
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