Question

How to solve for y -2x(x+3y)=18

Answer 1

y = 2(9+x2)

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1−6x

x=−3y+√9y2+2y−36

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2

Answer 2

I’m not sure if you are solving for y or x but if you are solving for y it’s
y=(2(9+x^2))/(1-6x)
or if your solving for x it is
x= (-3y+ sqr(9y^2+2y-36)) / (2)