10(r-1)=30

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Solution for 10(r-1)=30 equation:



10(r-1)=30
We move all terms to the left:
10(r-1)-(30)=0
We multiply parentheses
10r-10-30=0
We add all the numbers together, and all the variables
10r-40=0
We move all terms containing r to the left, all other terms to the right
10r=40
r=40/10
r=4

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