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-3.4x=-10.2
We move all terms to the left:
-3.4x-(-10.2)=0
We add all the numbers together, and all the variables
-3.4x+10.2=0
We move all terms containing x to the left, all other terms to the right
-3.4x=-10.2
x=-10.2/-3.4
x=+3
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