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1.7x-7.2x+1.7=-42.3
We move all terms to the left:
1.7x-7.2x+1.7-(-42.3)=0
We add all the numbers together, and all the variables
-5.5x+44=0
We move all terms containing x to the left, all other terms to the right
-5.5x=-44
x=-44/-5.5
x=+8
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