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9-x=18-4
We move all terms to the left:
9-x-(18-4)=0
We add all the numbers together, and all the variables
-x+9-14=0
We add all the numbers together, and all the variables
-1x-5=0
We move all terms containing x to the left, all other terms to the right
-x=5
x=5/-1
x=-5
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