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Express x in terms of y where 12*x+3*y=-9

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The solution

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12*x + 3*y = -9
$$12 x + 3 y = -9$$
Detail solution
Given the linear equation:
12*x+3*y = -9

Looking for similar summands in the left part:
3*y + 12*x = -9

Move the summands with the other variables
from left part to right part, we given:
$$12 x = - 3 y - 9$$
Divide both parts of the equation by 12
x = -9 - 3*y / (12)

We get the answer: x = -3/4 - y/4
Rapid solution [src]
       3   re(y)   I*im(y)
x1 = - - - ----- - -------
       4     4        4   
$$x_{1} = - \frac{\operatorname{re}{\left(y\right)}}{4} - \frac{i \operatorname{im}{\left(y\right)}}{4} - \frac{3}{4}$$
x1 = -re(y)/4 - i*im(y)/4 - 3/4