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90=-5(2+4r)
We move all terms to the left:
90-(-5(2+4r))=0
We add all the numbers together, and all the variables
-(-5(4r+2))+90=0
We calculate terms in parentheses: -(-5(4r+2)), so:We get rid of parentheses
-5(4r+2)
We multiply parentheses
-20r-10
Back to the equation:
-(-20r-10)
20r+10+90=0
We add all the numbers together, and all the variables
20r+100=0
We move all terms containing r to the left, all other terms to the right
20r=-100
r=-100/20
r=-5
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