y = -2x -4
Simplifying
y = -2x + -4
Reorder the terms:
y = -4 + -2x
Solving
y = -4 + -2x
Solving for variable 'y'.
Move all terms containing y to the left, all other terms to the right.
Simplifying
y = -4 + -2x
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Hope that helps you out :)