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120-4.5x=45+0.5x
We move all terms to the left:
120-4.5x-(45+0.5x)=0
We add all the numbers together, and all the variables
-4.5x-(0.5x+45)+120=0
We get rid of parentheses
-4.5x-0.5x-45+120=0
We add all the numbers together, and all the variables
-5x+75=0
We move all terms containing x to the left, all other terms to the right
-5x=-75
x=-75/-5
x=+15
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