Question 1118700
b,x,m,f
Ben, sister, Mother, Father


{{{system(b=x+3,3b=m,f=m+4,f=4x)}}}

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The two equations involving f:
{{{m+4=4x}}}
{{{m=4x-4}}}


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{{{3b=4x-4}}}
{{{4x=3b+4}}}
{{{x=3b/4+4/4}}}
{{{x=3b/4+1}}}



{{{b=x+3}}}
{{{b=3b/4+1+3}}}
{{{4b=3b+4*4}}}
{{{highlight(b=16)}}}