It's a simple linear equation in 'y'.
If you'd like to know the value of 'y' that makes it true,
you can find it as follows:
3y - 8 = 12
Add 8 to each side:
3y = 20
Divide each side by 3:
y = 20/3
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70000000y=35t
Multiply first equation by 1.5, giving 3x + 3y = 12, but we are told that 3x + 3y = 6. If there isn't an error in the question then 2 = 1!
y=8
are you talking about a system of equations where x+3y=-7 -x+2y=-8 if so, then the answer is {2,-3}
2y=8..... y=4