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Let:
\n$$
A=\\var{A}, B=\\var{B}, C=\\var{C}
$$
Calculate
", "advice": "Addition and subtraction are achieved by adding or subtracting corresponding elements:
\n
Using this technique gives us:
\na)
\n$A + B = \\var{A} + \\var{B} = \\var{A+B}$
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