X+(y-15)=90

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Solution for X+(y-15)=90 equation: 



X+(X-15)=90

We move all terms to the left:

X+(X-15)-(90)=0

We get rid of parentheses

X+X-15-90=0

We add all the numbers together, and all the variables

2X-105=0

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

2X=105

X=105/2

X=52+1/2

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