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1234567890.0987654321*987654321.123456789x=31
We move all terms to the left:
1234567890.0987654321*987654321.123456789x-(31)=0
We move all terms containing x to the left, all other terms to the right
1234567890.0987654321*987654321.123456789x=31
x=31/1
x=31
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