$$0.35(4F-2)=0.02(20F-5)$$
$F=0.6$
$$1.4F-0.7=0.02\left(20F-5\right)$$
$$1.4F-0.7=0.4F-0.1$$
$$1.4F-0.7-0.4F=-0.1$$
$$F-0.7=-0.1$$
$$F=-0.1+0.7$$
$$F=0.6$$
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