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0.13+0.09(y+4000)=1680
We move all terms to the left:
0.13+0.09(y+4000)-(1680)=0
We add all the numbers together, and all the variables
0.09(y+4000)-1679.87=0
We multiply parentheses
0.09y+360-1679.87=0
We add all the numbers together, and all the variables
0.09y-1319.87=0
We move all terms containing y to the left, all other terms to the right
0.09y=1319.87
y=1319.87/0.09
y=14665+0.019999999999982/0.09
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