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x=(4.50+2.50)-20
We move all terms to the left:
x-((4.50+2.50)-20)=0
We add all the numbers together, and all the variables
x-(7-20)=0
We add all the numbers together, and all the variables
x+13=0
We move all terms containing x to the left, all other terms to the right
x=-13
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