$$2x+5\frac{1}{2}=3\frac{1}{2}$$
$x=-1$
$$4x+5\times 2+1=3\times 2+1$$
$$4x+10+1=3\times 2+1$$
$$4x+11=3\times 2+1$$
$$4x+11=6+1$$
$$4x+11=7$$
$$4x=7-11$$
$$4x=-4$$
$$x=\frac{-4}{4}$$
$$x=-1$$
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