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4.5=-x/7.2
We move all terms to the left:
4.5-(-x/7.2)=0
We get rid of parentheses
x/7.2+4.5=0
We multiply all the terms by the denominator
x+(4.5)*7.2=0
We add all the numbers together, and all the variables
x+32.4=0
We move all terms containing x to the left, all other terms to the right
x=-32.4
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