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\[\begin{aligned}&a+b+c=10\\&a+c=7\\&a+b=8\\&a-b-c=x\end{aligned}\]
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a+b+c=10;a+c=7;a+b=8;a-b-c=x:substitution
a+b+c=10;a+c=7;a+b=8;a-b-c=x
\begin{aligned}&a+b+c=10\\&a+c=7\\&a+b=8\\&a-b-c=x\end{aligned}
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