if parameter value in every subsequent year depends on previous year value

Problems with modeling
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khanalb
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if parameter value in every subsequent year depends on previous year value

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let us suppose parameter value 10 & 20
for 1 st year
3x1+5x2=G=10
x1+7x2=G=20
if solving equation in 1 year getting the value p1 & q1 which is =G=10 & 20
for second year
3x1+5x2=G=10-(p1-10) if value 10-(p1-10) is neg then leave the equation 1 in second year
x1+7x2=G=20-(q1-10)
for third year
3x1+5x2=G=10-(p2-10) if value 10-(p1-10) is neg in 2nd year then (p2-10) will be equal to zero in third year
x1+7x2=G=20-(q2-10)

how to set this equation for several year in loop and with if condition
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