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9x+3.1=7x+2.4
We move all terms to the left:
9x+3.1-(7x+2.4)=0
We get rid of parentheses
9x-7x-2.4+3.1=0
We add all the numbers together, and all the variables
2x+0.7=0
We move all terms containing x to the left, all other terms to the right
2x=-0.7
x=-0.7/2
x=-0.7/2
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