X+2y=990

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Solution for X+2y=990 equation: 



X+2X=990

We move all terms to the left:

X+2X-(990)=0

We add all the numbers together, and all the variables

3X-990=0

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

3X=990

X=990/3

X=330

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