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(r/2)*0.75=(100-r/4)*1.25
We move all terms to the left:
(r/2)*0.75-((100-r/4)*1.25)=0
We add all the numbers together, and all the variables
(+r/2)*0.75-((-r/4+100)*1.25)=0
We multiply parentheses
0.75r-((-r/4+100)*1.25)=0
We multiply all the terms by the denominator
(0.75r)*4-r+100)*1.25)-((=0
We add all the numbers together, and all the variables
(+0.75r)*4-r+100)*1.25)-((=0
We add all the numbers together, and all the variables
-1r+(+0.75r)*4=0
We multiply parentheses
-1r+0r=0
We add all the numbers together, and all the variables
=0
r=0/1
r=0
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