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145-2x=165-4x.
We move all terms to the left:
145-2x-(165-4x.)=0
We add all the numbers together, and all the variables
-2x-(-4x.+165)+145=0
We get rid of parentheses
-2x+4x.-165+145=0
We add all the numbers together, and all the variables
-2x+4x.-20=0
We move all terms containing x to the left, all other terms to the right
-2x+4x.=20
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