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-.5x+13=3x
We move all terms to the left:
-.5x+13-(3x)=0
We add all the numbers together, and all the variables
-3.5x+13=0
We move all terms containing x to the left, all other terms to the right
-3.5x=-13
x=-13/-3.5
x=3+2.5/3.5
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