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205=0.4x+65
We move all terms to the left:
205-(0.4x+65)=0
We get rid of parentheses
-0.4x-65+205=0
We add all the numbers together, and all the variables
-0.4x+140=0
We move all terms containing x to the left, all other terms to the right
-0.4x=-140
x=-140/-0.4
x=+350
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