$$3.9-(x-1.2)=6.3$$
$x=-1.2$
$$3.9-x-\left(-1.2\right)=6.3$$
$$3.9-x+1.2=6.3$$
$$5.1-x=6.3$$
$$-x=6.3-5.1$$
$$-x=1.2$$
$$x=-1.2$$
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