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x^2-1=x^2+3x
-1=3x /:3
x=-1/3
c) 10(x-1)=3(x+2)
10x-10=3x+6
10x-3x=6+10
7x=16
x=16/7
f) (b-2)(b-3)=b(b+1)
b^2-3b-2b+6=b^2+b
-5b-b=-6
-6b=-6
b=1
b)4x=2(x+1)
4x=2x+2
4x-2x=2
2x=2
x=1