Question 1079759
{{{system(A/B=3/5,(A-10)/(B+10)=1/3)}}}


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5A=3B
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{{{3(A-10)=B+10}}}
{{{B=3A-30-10}}}
{{{B=3A-40}}}
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{{{5A=3(3A-40)}}}
{{{5A=9A-120}}}
{{{-4A=-120}}}
{{{highlight(A=30)}}}


{{{highlight(B=50)}}}