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OpenStudy (anonymous):
Solve the system x1x1+x2x2+x3x3+x4+x4====2−114 1 free parameter. let's call it s :)
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OpenStudy (anonymous):
Solve the system \left\{ \begin{array}{r@{}r@{}r@{}r@{}r@{}r} x_1 & + x_2 & & & = & 2 \cr & x_2 & + x_3 & & = & -1 \cr & & x_3 & + x_4 & = & 1 \cr x_1 & & & + x_4 & = & 4 \end{array} \right. /fix. sorry
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