a:=>(y-4)(x-3)=-3
\(\Leftrightarrow\left(x-3;y-4\right)\in\left\{\left(1;-3\right);\left(-3;1\right);\left(-1;3\right);\left(3;-1\right)\right\}\)
hay \(\left(x,y\right)\in\left\{\left(4;1\right);\left(0;5\right);\left(2;7\right);\left(6;3\right)\right\}\)
b: =>2x(y-2)-y+2=4
=>(y-2)(2x-1)=4
\(\Leftrightarrow\left(2x-1;y-2\right)\in\left\{\left(1;4\right);\left(-1;-4\right)\right\}\)
hay \(\left(x,y\right)\in\left\{\left(1;6\right);\left(0;-2\right)\right\}\)
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