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2.9x-5.8+9x=9.9x-12.8
We move all terms to the left:
2.9x-5.8+9x-(9.9x-12.8)=0
We add all the numbers together, and all the variables
11.9x-(9.9x-12.8)-5.8=0
We get rid of parentheses
11.9x-9.9x+12.8-5.8=0
We add all the numbers together, and all the variables
2x+7=0
We move all terms containing x to the left, all other terms to the right
2x=-7
x=-7/2
x=-3+1/2
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