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13=2.50-3x
We move all terms to the left:
13-(2.50-3x)=0
We add all the numbers together, and all the variables
-(-3x+2.5)+13=0
We get rid of parentheses
3x-2.5+13=0
We add all the numbers together, and all the variables
3x+10.5=0
We move all terms containing x to the left, all other terms to the right
3x=-10.5
x=-10.5/3
x=-3+1/2
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