X=30+45-x

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Solution for X=30+45-x equation: 



X=30+45-X

We move all terms to the left:

X-(30+45-X)=0

We add all the numbers together, and all the variables

X-(-1X+75)=0

We get rid of parentheses

X+1X-75=0

We add all the numbers together, and all the variables

2X-75=0

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

2X=75

X=75/2

X=37+1/2

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