-x=3y+4

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Solution for -x=3y+4 equation: 


Simplifying
-1x = 3y + 4

Reorder the terms:
-1x = 4 + 3y

Solving
-1x = 4 + 3y

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Divide each side by '-1'.
x = -4 + -3y

Simplifying
x = -4 + -3y

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