21=-1/2x+15

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Solution for 21=-1/2x+15 equation: 



21=-1/2x+15

We move all terms to the left:

21-(-1/2x+15)=0



Domain of the equation: 2x+15)!=0

x∈R



We get rid of parentheses

1/2x-15+21=0

We multiply all the terms by the denominator


-15*2x+21*2x+1=0

Wy multiply elements

-30x+42x+1=0

We add all the numbers together, and all the variables

12x+1=0

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

12x=-1

x=-1/12

x=-1/12

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