Without an equality sign and not knowing the plus or minus values of 7y and 2y the expression given can't be considered to be an equation
-2y = 10 2y = -10 y = -5
2y = 4 (divide both sides by 2 to solve) y = 2
22
9+2y=3 2y=-6 y=-3
3x + 2y = 12 ie 2y = 12 - 3x so y = 6 - 3x/2
2y-3x=4
3x-2y=6 -2y=-3x+6 y=1.5x-3
2y + 4 = 3ySubtract 2y from both sides:4 = ywhew
2y = 4x + 4y = 2x + 2
if you mean 5x -2y = 10 then y = 2.5x -5
2y = 15 y = 15/2 y = 7.5
-2x - 2y = -122x + 2y = 122y = 12 - 2xy = 6 - x