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17=3.9x+1.4
We move all terms to the left:
17-(3.9x+1.4)=0
We get rid of parentheses
-3.9x-1.4+17=0
We add all the numbers together, and all the variables
-3.9x+15.6=0
We move all terms containing x to the left, all other terms to the right
-3.9x=-15.6
x=-15.6/-3.9
x=+4
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