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0.04x+0.05(x+1200)=141
We move all terms to the left:
0.04x+0.05(x+1200)-(141)=0
We multiply parentheses
0.04x+0.05x+60-141=0
We add all the numbers together, and all the variables
0.09x-81=0
We move all terms containing x to the left, all other terms to the right
0.09x=81
x=81/0.09
x=900
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