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18=90b*5
We move all terms to the left:
18-(90b*5)=0
We add all the numbers together, and all the variables
-(+90b*5)+18=0
We get rid of parentheses
-90b*5+18=0
Wy multiply elements
-450b+18=0
We move all terms containing b to the left, all other terms to the right
-450b=-18
b=-18/-450
b=1/25
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