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n/10+9=12
We simplify the equation to the form, which is simple to understand
n/10+9=12
We move all terms containing n to the left and all other terms to the right.
+ 0.1n=+12-9
We simplify left and right side of the equation.
+ 0.1n=+3
We divide both sides of the equation by 0.1 to get n.
n=30
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