(X/2-6)+x=21

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Solution for (X/2-6)+x=21 equation: 



(X/2-6)+X=21

We move all terms to the left:

(X/2-6)+X-(21)=0

We add all the numbers together, and all the variables

X+(X/2-6)-21=0

We get rid of parentheses

X+X/2-6-21=0

We multiply all the terms by the denominator


X*2+X-6*2-21*2=0

We add all the numbers together, and all the variables

X+X*2-54=0

Wy multiply elements

X+2X-54=0

We add all the numbers together, and all the variables

3X-54=0

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

3X=54

X=54/3

X=18

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