(x+1)/(x+3)=15/21

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Solution for (x+1)/(x+3)=15/21 equation: 



(x+1)/(x+3)=15/21

We move all terms to the left:

(x+1)/(x+3)-(15/21)=0



Domain of the equation: (x+3)!=0

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

x!=-3

x∈R



We add all the numbers together, and all the variables

(x+1)/(x+3)-(+15/21)=0

We get rid of parentheses

(x+1)/(x+3)-15/21=0

We calculate fractions


(21x+21)/(21x+63)+(-15x-45)/(21x+63)=0

We multiply all the terms by the denominator


(21x+21)+(-15x-45)=0

We get rid of parentheses

21x-15x+21-45=0

We add all the numbers together, and all the variables

6x-24=0

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

6x=24

x=24/6

x=4

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