91=100*0.6+x*0.4

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Solution for 91=100*0.6+x*0.4 equation: 



91=100*0.6+x*0.4

We move all terms to the left:

91-(100*0.6+x*0.4)=0

We add all the numbers together, and all the variables

-(x*0.4+60)+91=0

We get rid of parentheses

-x*0.4-60+91=0

We add all the numbers together, and all the variables

-x*0.4+31=0

Wy multiply elements

-0.4x+31=0

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

-0.4x=-31

x=-31/-0.4

x=77+0.2/0.4

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