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0.8x+51.2=7.2x
We move all terms to the left:
0.8x+51.2-(7.2x)=0
We add all the numbers together, and all the variables
0.8x-(+7.2x)+51.2=0
We get rid of parentheses
0.8x-7.2x+51.2=0
We add all the numbers together, and all the variables
-6.4x+51.2=0
We move all terms containing x to the left, all other terms to the right
-6.4x=-51.2
x=-51.2/-6.4
x=+8
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