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-3.5=712+x
We move all terms to the left:
-3.5-(712+x)=0
We add all the numbers together, and all the variables
-(x+712)-3.5=0
We get rid of parentheses
-x-712-3.5=0
We add all the numbers together, and all the variables
-1x-715.5=0
We move all terms containing x to the left, all other terms to the right
-x=715.5
x=715.5/-1
x=-715+0.5/1
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