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400/10=x/4
We move all terms to the left:
400/10-(x/4)=0
We add all the numbers together, and all the variables
-(+x/4)+400/10=0
We add all the numbers together, and all the variables
-(+x/4)+40=0
We get rid of parentheses
-x/4+40=0
We multiply all the terms by the denominator
-x+40*4=0
We add all the numbers together, and all the variables
-1x+160=0
We move all terms containing x to the left, all other terms to the right
-x=-160
x=-160/-1
x=+160
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