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9-x3.x=6.5
We move all terms to the left:
9-x3.x-(6.5)=0
We add all the numbers together, and all the variables
-x3.x+2.5=0
We move all terms containing x to the left, all other terms to the right
-x3.x=-2.5
x=-2.5/1
x=-2.5
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