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0.8x-4=0.3x+7
We move all terms to the left:
0.8x-4-(0.3x+7)=0
We get rid of parentheses
0.8x-0.3x-7-4=0
We add all the numbers together, and all the variables
0.5x-11=0
We move all terms containing x to the left, all other terms to the right
0.5x=11
x=11/0.5
x=22
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