-2x-10y-12+3xy=4
Put all x's to the other side and the ones with y's on the other:
-10y+3xy=4+2x+12
-10y+3xy=16+2x
Now you factor a y from the side with the y's:
y(-10+3x)=16+2x
Divide both sides by (-10+3x):
y=(16+2x)/(-10+3x)
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3x=12 3x/3=12/3 x=4
3x+4 = 2x-3 3x-2x = -3-4 x = -7
x=4 x=4
12/3 = 4
You don't, unless you know either the value of x or what the expression equals.