$$4 \times +5=2x+25$$
$x = -\frac{5}{2} = -2\frac{1}{2} = -2.5$
$$20=2x+25$$
$$2x+25=20$$
$$2x=20-25$$
$$2x=-5$$
$$x=\frac{-5}{2}$$
$$x=-\frac{5}{2}$$
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