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320-40x=4x+20
We move all terms to the left:
320-40x-(4x+20)=0
We get rid of parentheses
-40x-4x-20+320=0
We add all the numbers together, and all the variables
-44x+300=0
We move all terms containing x to the left, all other terms to the right
-44x=-300
x=-300/-44
x=6+9/11
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