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640000=x+1.2x
We move all terms to the left:
640000-(x+1.2x)=0
We add all the numbers together, and all the variables
-(+2.2x)+640000=0
We get rid of parentheses
-2.2x+640000=0
We move all terms containing x to the left, all other terms to the right
-2.2x=-640000
x=-640000/-2.2
x=290909+0.19999999995343/2.2
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