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