X+-4y=-30

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Solution for X+-4y=-30 equation: 



X+-4X=-30

We move all terms to the left:

X+-4X-(-30)=0

We add all the numbers together, and all the variables

-3X+30=0

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

-3X=-30

X=-30/-3

X=+10

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