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Garis yang melalui titik $(\\var{a},\\var{b},\\var{c})$, sejajar dengan bidang $x+y+z=\\var{a}$, dan tegak lurus dengan garis $x(t)=\\var{c}+t$, $y(t)=\\var{b}-t$, $z(t)=2t+\\var{a}$ mempunyai vektor arah $\\mathbf{v}=\\left\\langle a,1,b \\right\\rangle$ dengan $a+b=\\ldots$.

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