-12=3(-5+r)

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Solution for -12=3(-5+r) equation:



-12=3(-5+r)
We move all terms to the left:
-12-(3(-5+r))=0
We add all the numbers together, and all the variables
-(3(r-5))-12=0
We calculate terms in parentheses: -(3(r-5)), so:
3(r-5)
We multiply parentheses
3r-15
Back to the equation:
-(3r-15)
We get rid of parentheses
-3r+15-12=0
We add all the numbers together, and all the variables
-3r+3=0
We move all terms containing r to the left, all other terms to the right
-3r=-3
r=-3/-3
r=1

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