4x-15+X=90

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Solution for 4x-15+X=90 equation: 



4x-15+x=90

We move all terms to the left:

4x-15+x-(90)=0

We add all the numbers together, and all the variables

5x-105=0

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

5x=105

x=105/5

x=21

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