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