30-4x=90

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Solution for 30-4x=90 equation: 



30-4x=90

We move all terms to the left:

30-4x-(90)=0

We add all the numbers together, and all the variables

-4x-60=0

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

-4x=60

x=60/-4

x=-15

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