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4(9-x)=15
We move all terms to the left:
4(9-x)-(15)=0
We add all the numbers together, and all the variables
4(-1x+9)-15=0
We multiply parentheses
-4x+36-15=0
We add all the numbers together, and all the variables
-4x+21=0
We move all terms containing x to the left, all other terms to the right
-4x=-21
x=-21/-4
x=5+1/4
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