$$7.2-(z-6.1)=6.3$$
$z=7$
$$7.2-z-\left(-6.1\right)=6.3$$
$$7.2-z+6.1=6.3$$
$$13.3-z=6.3$$
$$-z=6.3-13.3$$
$$-z=-7$$
$$z=7$$
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