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4x-10x+12.6=-28.8
We move all terms to the left:
4x-10x+12.6-(-28.8)=0
We add all the numbers together, and all the variables
-6x+41.4=0
We move all terms containing x to the left, all other terms to the right
-6x=-41.4
x=-41.4/-6
x=6+3.85714285714/4.28571428571
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