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1/2(20+18)=4x-9
We move all terms to the left:
1/2(20+18)-(4x-9)=0
We add all the numbers together, and all the variables
-(4x-9)+1/238=0
We get rid of parentheses
-4x+9+1/238=0
We multiply all the terms by the denominator
-4x*238+1+9*238=0
We add all the numbers together, and all the variables
-4x*238+2143=0
Wy multiply elements
-952x+2143=0
We move all terms containing x to the left, all other terms to the right
-952x=-2143
x=-2143/-952
x=2+239/952
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