0.9=x/2.1

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Solution for 0.9=x/2.1 equation: 



0.9=x/2.1

We move all terms to the left:

0.9-(x/2.1)=0

We add all the numbers together, and all the variables

-(+x/2.1)+0.9=0

We get rid of parentheses

-x/2.1+0.9=0

We multiply all the terms by the denominator


-x+(0.9)*2.1=0

We add all the numbers together, and all the variables

-1x+1.89=0

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

-x=-1.89

x=-1.89/-1

x=1+0.89/1

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