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r/10+3=12
We simplify the equation to the form, which is simple to understand
r/10+3=12
Simplifying:
+ 0.1r+3=12
We move all terms containing r to the left and all other terms to the right.
+ 0.1r=+12-3
We simplify left and right side of the equation.
+ 0.1r=+9
We divide both sides of the equation by 0.1 to get r.
r=90
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