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(5.5+3.2)x=100
We move all terms to the left:
(5.5+3.2)x-(100)=0
We add all the numbers together, and all the variables
(8.7)x-100=0
We multiply parentheses
8.7x-100=0
We move all terms containing x to the left, all other terms to the right
8.7x=100
x=100/8.7
x=11+1/2.0232558139535
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