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3.6-4x=7.2
We move all terms to the left:
3.6-4x-(7.2)=0
We add all the numbers together, and all the variables
-4x-3.6=0
We move all terms containing x to the left, all other terms to the right
-4x=3.6
x=3.6/-4
x=-2.25/2.5
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