-x+15=90

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Solution for -x+15=90 equation: 



-x+15=90

We move all terms to the left:

-x+15-(90)=0

We add all the numbers together, and all the variables

-1x-75=0

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

-x=75

x=75/-1

x=-75

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