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3-x/10=-12
We move all terms to the left:
3-x/10-(-12)=0
We add all the numbers together, and all the variables
-x/10+15=0
We multiply all the terms by the denominator
-x+15*10=0
We add all the numbers together, and all the variables
-1x+150=0
We move all terms containing x to the left, all other terms to the right
-x=-150
x=-150/-1
x=+150
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