Question 1136711
Two-digit number,  {{{10t+u}}}


{{{system(t+u=13,2t=-2+5u)}}}


{{{2t+2u=26}}}
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{{{2t=26-2u=5u-2}}}
{{{26-2u=5u-2}}}
{{{26=7u-2}}}
{{{28=7u}}}
{{{highlight_green(u=4)}}}
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{{{highlight_green(t=9)}}}


{{{highlight_green(highlight(94))}}}----------the two-digit number