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0.40(x+200)=900
We move all terms to the left:
0.40(x+200)-(900)=0
We multiply parentheses
0.4x+80-900=0
We add all the numbers together, and all the variables
0.4x-820=0
We move all terms containing x to the left, all other terms to the right
0.4x=820
x=820/0.4
x=2050
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