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900000=40*4x+140x
We move all terms to the left:
900000-(40*4x+140x)=0
We add all the numbers together, and all the variables
-(+140x+40*4x)+900000=0
We get rid of parentheses
-140x-40*4x+900000=0
Wy multiply elements
-140x-160x+900000=0
We add all the numbers together, and all the variables
-300x+900000=0
We move all terms containing x to the left, all other terms to the right
-300x=-900000
x=-900000/-300
x=+3000
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