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x+8.7x=873
We move all terms to the left:
x+8.7x-(873)=0
We add all the numbers together, and all the variables
9.7x-873=0
We move all terms containing x to the left, all other terms to the right
9.7x=873
x=873/9.7
x=90+1.13686837722E-13/9.7
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