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r/4-1=19
We simplify the equation to the form, which is simple to understand
r/4-1=19
Simplifying:
+ 0.25r-1=19
We move all terms containing r to the left and all other terms to the right.
+ 0.25r=+19+1
We simplify left and right side of the equation.
+ 0.25r=+20
We divide both sides of the equation by 0.25 to get r.
r=80
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