15-3x=90

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Solution for 15-3x=90 equation: 



15-3x=90

We move all terms to the left:

15-3x-(90)=0

We add all the numbers together, and all the variables

-3x-75=0

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

-3x=75

x=75/-3

x=-25

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