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9.9x-12=6.2x+6
We move all terms to the left:
9.9x-12-(6.2x+6)=0
We get rid of parentheses
9.9x-6.2x-6-12=0
We add all the numbers together, and all the variables
3.7x-18=0
We move all terms containing x to the left, all other terms to the right
3.7x=18
x=18/3.7
x=4+1/1.15625
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