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18b/9+2b*4=20^2
We move all terms to the left:
18b/9+2b*4-(20^2)=0
We add all the numbers together, and all the variables
18b/9+2b*4-400=0
Wy multiply elements
18b/9+8b-400=0
We multiply all the terms by the denominator
18b+8b*9-400*9=0
We add all the numbers together, and all the variables
18b+8b*9-3600=0
Wy multiply elements
18b+72b-3600=0
We add all the numbers together, and all the variables
90b-3600=0
We move all terms containing b to the left, all other terms to the right
90b=3600
b=3600/90
b=40
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