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-0.07x+0.03(x+40000)=320
We move all terms to the left:
-0.07x+0.03(x+40000)-(320)=0
We multiply parentheses
-0.07x+0.03x+1200-320=0
We add all the numbers together, and all the variables
-0.04x+880=0
We move all terms containing x to the left, all other terms to the right
-0.04x=-880
x=-880/-0.04
x=+22000
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