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9=4+x/6.25
We move all terms to the left:
9-(4+x/6.25)=0
We add all the numbers together, and all the variables
-(x/6.25+4)+9=0
We get rid of parentheses
-x/6.25-4+9=0
We multiply all the terms by the denominator
-x-4*6.25+9*6.25=0
We add all the numbers together, and all the variables
-1x+31.25=0
We move all terms containing x to the left, all other terms to the right
-x=-31.25
x=-31.25/-1
x=31+0.25/1
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