$$-F+2+4F=8-3F.......F=$$
$F=1$
$$-F+2+4F+3F=8$$
$$-F+2+7F=8$$
$$-F+7F=8-2$$
$$-F+7F=6$$
$$6F=6$$
$$F=\frac{6}{6}$$
$$F=1$$
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