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8.3-0.7x=2
We move all terms to the left:
8.3-0.7x-(2)=0
We add all the numbers together, and all the variables
-0.7x+6.3=0
We move all terms containing x to the left, all other terms to the right
-0.7x=-6.3
x=-6.3/-0.7
x=+9
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