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40+20x/4=9x-13
We move all terms to the left:
40+20x/4-(9x-13)=0
We get rid of parentheses
20x/4-9x+13+40=0
We multiply all the terms by the denominator
20x-9x*4+13*4+40*4=0
We add all the numbers together, and all the variables
20x-9x*4+212=0
Wy multiply elements
20x-36x+212=0
We add all the numbers together, and all the variables
-16x+212=0
We move all terms containing x to the left, all other terms to the right
-16x=-212
x=-212/-16
x=13+1/4
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