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(x-21)/7=1.8
We move all terms to the left:
(x-21)/7-(1.8)=0
We add all the numbers together, and all the variables
(x-21)/7-1.8=0
We multiply all the terms by the denominator
(x-21)-(1.8)*7=0
We add all the numbers together, and all the variables
(x-21)-12.6=0
We get rid of parentheses
x-21-12.6=0
We add all the numbers together, and all the variables
x-33.6=0
We move all terms containing x to the left, all other terms to the right
x=33.6
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