20=1/2*b*4

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Solution for 20=1/2*b*4 equation: 



20=1/2b*4

We move all terms to the left:

20-(1/2b*4)=0



Domain of the equation: 2b*4)!=0

b!=0/1

b!=0

b∈R



We add all the numbers together, and all the variables

-(+1/2b*4)+20=0

We get rid of parentheses

-1/2b*4+20=0

We multiply all the terms by the denominator


20*2b*4-1=0

Wy multiply elements

160b*4-1=0

Wy multiply elements

640b-1=0

We move all terms containing b to the left, all other terms to the right

640b=1

b=1/640

b=1/640

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