$$7x+7-3x+3=0$$
$x = -\frac{5}{2} = -2\frac{1}{2} = -2.5$
$$4x+7+3=0$$
$$4x+10=0$$
$$4x=-10$$
$$x=\frac{-10}{4}$$
$$x=-\frac{5}{2}$$
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