Question 1181295
Original dimensions, w+1 and w.


{{{(w-1)(w-2)=-30+w(w+1)}}}

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{{{w^2+w-30=w^2-3w+2}}}
{{{w-30=-3w+2}}}
{{{4w=32}}}
{{{w=8}}}


Dimensions of original rectangle,  9 units length,  8 units width