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75=4.5x+120
We move all terms to the left:
75-(4.5x+120)=0
We get rid of parentheses
-4.5x-120+75=0
We add all the numbers together, and all the variables
-4.5x-45=0
We move all terms containing x to the left, all other terms to the right
-4.5x=45
x=45/-4.5
x=-10
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