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0.06y+40-0.03y=70
We move all terms to the left:
0.06y+40-0.03y-(70)=0
We add all the numbers together, and all the variables
0.03y-30=0
We move all terms containing y to the left, all other terms to the right
0.03y=30
y=30/0.03
y=1000
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