90=r/7+84

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Solution for 90=r/7+84 equation:



90=r/7+84
We move all terms to the left:
90-(r/7+84)=0
We get rid of parentheses
-r/7-84+90=0
We multiply all the terms by the denominator
-r-84*7+90*7=0
We add all the numbers together, and all the variables
-1r+42=0
We move all terms containing r to the left, all other terms to the right
-r=-42
r=-42/-1
r=+42

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