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X-18/2=-4X

We move all terms to the left:

X-18/2-(-4X)=0

We add all the numbers together, and all the variables

X-(-4X)-9=0

We get rid of parentheses

X+4X-9=0

We add all the numbers together, and all the variables

5X-9=0

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

5X=9

X=9/5

X=1+4/5

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