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170=440-900x
We move all terms to the left:
170-(440-900x)=0
We add all the numbers together, and all the variables
-(-900x+440)+170=0
We get rid of parentheses
900x-440+170=0
We add all the numbers together, and all the variables
900x-270=0
We move all terms containing x to the left, all other terms to the right
900x=270
x=270/900
x=3/10
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