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4x=5x-900
We move all terms to the left:
4x-(5x-900)=0
We get rid of parentheses
4x-5x+900=0
We add all the numbers together, and all the variables
-1x+900=0
We move all terms containing x to the left, all other terms to the right
-x=-900
x=-900/-1
x=+900
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