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-7x=-4.2
We move all terms to the left:
-7x-(-4.2)=0
We add all the numbers together, and all the variables
-7x+4.2=0
We move all terms containing x to the left, all other terms to the right
-7x=-4.2
x=-4.2/-7
x=3.5/5.8333333333333
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