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r=5.4*2.4/7.2
We move all terms to the left:
r-(5.4*2.4/7.2)=0
We add all the numbers together, and all the variables
r-(+5.4*2.4/7.2)=0
We get rid of parentheses
r-5.4*2.4/7.2=0
We multiply all the terms by the denominator
r*7.2-5.4*2.4=0
We add all the numbers together, and all the variables
r*7.2-12.96=0
Wy multiply elements
7.2r-12.96=0
We move all terms containing r to the left, all other terms to the right
7.2r=12.96
r=12.96/7.2
r=1+3.2727272727273/4.0909090909091
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