Question 1146709
m, Manuel
d, Delaney
x,  how many years ago
p, factor
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{{{m-x=p(d-x)}}}

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{{{m-x=pd-px}}}

{{{m-pd=x-px}}}

{{{pd-m=px-x}}}

{{{(p-1)x=pd-m}}}

{{{highlight_green(x=(pd-m)/(p-1))}}}

Make the substitutions  {{{system(m=43,d=30,p=2)}}}.